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<front>
<journal-meta>
<journal-id journal-id-type="publisher">BG</journal-id>
<journal-title-group>
<journal-title>Biogeosciences</journal-title>
<abbrev-journal-title abbrev-type="publisher">BG</abbrev-journal-title>
<abbrev-journal-title abbrev-type="nlm-ta">Biogeosciences</abbrev-journal-title>
</journal-title-group>
<issn pub-type="epub">1726-4189</issn>
<publisher><publisher-name>Copernicus Publications</publisher-name>
<publisher-loc>Göttingen, Germany</publisher-loc>
</publisher>
</journal-meta>
<article-meta>
<article-id pub-id-type="doi">10.5194/bg-10-541-2013</article-id>
<title-group>
<article-title>Identifying urban sources as cause of elevated grass pollen concentrations using GIS and remote sensing</article-title>
</title-group>
<contrib-group><contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Skjøth</surname>
<given-names>C. A.</given-names>
<ext-link>https://orcid.org/0000-0001-5992-9568</ext-link>
</name>
<xref ref-type="aff" rid="aff1">
<sup>1</sup>
</xref>
<xref ref-type="aff" rid="aff2">
<sup>2</sup>
</xref>
</contrib>
<contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Ørby</surname>
<given-names>P. V.</given-names>
</name>
<xref ref-type="aff" rid="aff3">
<sup>3</sup>
</xref>
</contrib>
<contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Becker</surname>
<given-names>T.</given-names>
</name>
<xref ref-type="aff" rid="aff2">
<sup>2</sup>
</xref>
</contrib>
<contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Geels</surname>
<given-names>C.</given-names>
</name>
<xref ref-type="aff" rid="aff2">
<sup>2</sup>
</xref>
</contrib>
<contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Schlünssen</surname>
<given-names>V.</given-names>
</name>
<xref ref-type="aff" rid="aff3">
<sup>3</sup>
</xref>
</contrib>
<contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Sigsgaard</surname>
<given-names>T.</given-names>
</name>
<xref ref-type="aff" rid="aff3">
<sup>3</sup>
</xref>
</contrib>
<contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Bønløkke</surname>
<given-names>J. H.</given-names>
</name>
<xref ref-type="aff" rid="aff3">
<sup>3</sup>
</xref>
</contrib>
<contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Sommer</surname>
<given-names>J.</given-names>
</name>
<xref ref-type="aff" rid="aff4">
<sup>4</sup>
</xref>
</contrib>
<contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Søgaard</surname>
<given-names>P.</given-names>
</name>
<xref ref-type="aff" rid="aff5">
<sup>5</sup>
</xref>
</contrib>
<contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Hertel</surname>
<given-names>O.</given-names>
</name>
<xref ref-type="aff" rid="aff2">
<sup>2</sup>
</xref>
<xref ref-type="aff" rid="aff6">
<sup>6</sup>
</xref>
</contrib>
</contrib-group><aff id="aff1">
<label>1</label>
<addr-line>Department of Physical Geography and Ecosystems Science, Sölvegatan 12, Lund University, 223 62 Lund, Sweden</addr-line>
</aff>
<aff id="aff2">
<label>2</label>
<addr-line>Department of Environmental Science, Aarhus University, P.O. Box 358, Frederiksborgvej 399, 4000 Roskilde, Denmark</addr-line>
</aff>
<aff id="aff3">
<label>3</label>
<addr-line>Department of Public Health, Aarhus University, Bartholins Allé 2, 8000 Aarhus C, Denmark</addr-line>
</aff>
<aff id="aff4">
<label>4</label>
<addr-line>Asthma and Allergy Association Denmark, Universitetsparken 4, 4000 Roskilde, Denmark</addr-line>
</aff>
<aff id="aff5">
<label>5</label>
<addr-line>Department of Nature and Environment, Municipality of Aarhus, P.O. Box 79, Valdemarsgade 18, 8100 Aarhus, Denmark</addr-line>
</aff>
<aff id="aff6">
<label>6</label>
<addr-line>Department for Environmental, Social and Spatial Change (ENSPAC), Roskilde University, P.O. Box 260, Universitetsvej 1, 4000 Roskilde, Denmark</addr-line>
</aff>
<pub-date pub-type="epub">
<day>29</day>
<month>01</month>
<year>2013</year>
</pub-date>
<volume>10</volume>
<issue>1</issue>
<fpage>541</fpage>
<lpage>554</lpage>
<permissions>
<copyright-statement>Copyright: &#x000a9; 2013 C. A. Skjøth et al.</copyright-statement>
<copyright-year>2013</copyright-year>
<license license-type="open-access">
<license-p>This work is licensed under the Creative Commons Attribution 3.0 Unported License. To view a copy of this licence, visit <ext-link ext-link-type="uri"  xlink:href="https://creativecommons.org/licenses/by/3.0/">https://creativecommons.org/licenses/by/3.0/</ext-link></license-p>
</license>
</permissions>
<self-uri xlink:href="https://bg.copernicus.org/articles/10/541/2013/bg-10-541-2013.html">This article is available from https://bg.copernicus.org/articles/10/541/2013/bg-10-541-2013.html</self-uri>
<self-uri xlink:href="https://bg.copernicus.org/articles/10/541/2013/bg-10-541-2013.pdf">The full text article is available as a PDF file from https://bg.copernicus.org/articles/10/541/2013/bg-10-541-2013.pdf</self-uri>
<abstract>
<p>We examine here the hypothesis that during flowering, the grass pollen
concentrations at a specific site reflect the distribution of grass pollen
sources within a few kilometres of this site. We perform this analysis on
data from a measurement campaign in the city of Aarhus (Denmark) using three
pollen traps and by comparing these observations with a novel inventory of
grass pollen sources. The source inventory is based on a new methodology
developed for urban-scale grass pollen sources. The new methodology is
believed to be generally applicable for the European area, as it relies on
commonly available remote sensing data combined with management information
for local grass areas. The inventory has identified a number of grass pollen
source areas present within the city domain. The comparison of the measured
pollen concentrations with the inventory shows that the atmospheric
concentrations of grass pollen in the urban zone reflect the source areas
identified in the inventory, and that the pollen sources that are found to
affect the pollen levels are located near or within the city domain. The
results also show that during days with peak levels of pollen concentrations
there is no correlation between the three urban traps and an operational trap
located just 60 km away. This finding suggests that during intense
flowering, the grass pollen concentration mirrors the local source
distribution and is thus a local-scale phenomenon. Model simulations aimed at
assessing population exposure to pollen levels are therefore recommended to
take into account both local sources and local atmospheric transport, and not
to rely only on describing regional to long-range transport of pollen. The
derived pollen source inventory can be entered into local-scale atmospheric
transport models in combination with other components that simulate pollen
release in order to calculate urban-scale variations in the grass pollen
load. The gridded inventory with a resolution of 14 m is therefore made
available as supplementary material to this paper, and the verifying grass
pollen observations are additionally available in tabular form.</p>
</abstract>
<counts><page-count count="14"/></counts>
</article-meta>
</front>
<body/>
<back>
<ref-list>
<title>References</title>
<ref id="ref1">
<label>1</label><mixed-citation publication-type="other" xlink:type="simple">Alcazar, P., Galan, C., Carinanos, P., and Dominguez-Vilches, E.: Effects of sampling height and climatic conditions in aerobiological studies, J. Invest. Allerg. Clin., 9, 253–261, 1999.</mixed-citation>
</ref>
<ref id="ref2">
<label>2</label><mixed-citation publication-type="other" xlink:type="simple">Avolio, E., Pasqualoni, L., Federico, S., Fornaciari, M., Bonofiglio, T., Orlandi, F., Bellecci, C., and Romano, B.: Correlation between large-scale atmospheric fields and the olive pollen season in Central Italy, Int. J. Biometeorol., 52, 787–796, 2008.</mixed-citation>
</ref>
<ref id="ref3">
<label>3</label><mixed-citation publication-type="other" xlink:type="simple">Belmonte, J., Alarcon, M., Avila, A., Scialabba, E., and Pino, D.: Long-range transport of beech (&lt;i&gt;Fagus sylvatica&lt;/i&gt; L.) pollen to Catalonia (north-eastern Spain), Int. J. Biometeorol., 52, 675–687, 2008.</mixed-citation>
</ref>
<ref id="ref4">
<label>4</label><mixed-citation publication-type="other" xlink:type="simple">Bicheron, P., Defourny, P., Brockmann, C., Schouten, L., Vancutsem, C., Huc, M., Bontemps, S., Leroy, M., Achard, F., Herold, M., Ranera, F., and Arino, O.: Globcover products description Manual MEDIAS-France, 2008.</mixed-citation>
</ref>
<ref id="ref5">
<label>5</label><mixed-citation publication-type="other" xlink:type="simple">Brandt, J., Silver, J. D., Frohn, L. M., Geels, C., Gross, A., Hansen, A. B., Hansen, K. M., Hedegaard, G. B., Skjøth, C. A., Villadsen, H., Zare, A., and Christensen, J. H.: An integrated model study for Europe and North America using the Danish Eulerian Hemispheric Model with focus on intercontinental transport of air pollution, Atmos. Environ., 53, 156–176, 2012.</mixed-citation>
</ref>
<ref id="ref6">
<label>6</label><mixed-citation publication-type="other" xlink:type="simple">Bricchi, E., Frenguelli, G., and Mincigrucci, G.: Experimental results about Platanus pollen deposition, Aerobiologia, 16, 347–352, 2000.</mixed-citation>
</ref>
<ref id="ref7">
<label>7</label><mixed-citation publication-type="other" xlink:type="simple">Brostrom, A., Nielsen, A. B., Gaillard, M. J., Hjelle, K., Mazier, F., Binney, H., Bunting, J., Fyfe, R., Meltsov, V., Poska, A., Rasanen, S., Soepboer, W., von Stedingk, H., Suutari, H., and Sugita, S.: Pollen productivity estimates of key European plant taxa for quantitative reconstruction of past vegetation: a review, Veg. Hist. Archaeobot., 17, 461–478, 2008.</mixed-citation>
</ref>
<ref id="ref8">
<label>8</label><mixed-citation publication-type="other" xlink:type="simple">Brown, H. M. and Irving, K. R.: Size and Weight of Common Allergenic Pollens – Investigation of Their Number Per Microgram and Size Distribution, Acta Allergol., 28, 132–137, 1973.</mixed-citation>
</ref>
<ref id="ref9">
<label>9</label><mixed-citation publication-type="other" xlink:type="simple">Carracedo-Martinez, E., Sanchez, C., Taracido, M., Saez, M., Jato, V., and Figueiras, A.: Effect of short-term exposure to air pollution and pollen on medical emergency calls: a case-crossover study in Spain, Allergy, 63, 347–353, 2008.</mixed-citation>
</ref>
<ref id="ref10">
<label>10</label><mixed-citation publication-type="other" xlink:type="simple">Cecchi, L., Malaspina, T., Albertini, R., Zanca, M., Ridolo, E., Usberti, I., Morabito, M., Dall&apos; Aglio, P., and Orlandini, S.: The contribution of long-distance transport to the presence of Ambrosia pollen in central northern Italy, Aerobiologia, 23, 145–151, 2007.</mixed-citation>
</ref>
<ref id="ref11">
<label>11</label><mixed-citation publication-type="other" xlink:type="simple">Chuine, I. and Belmonte, J.: Improving prophylaxis for pollen allergies: Predicting the time course of the pollen load of the atmosphere of major allergenic plants in France and Spain, Grana, 43, 65–80, 2004.</mixed-citation>
</ref>
<ref id="ref12">
<label>12</label><mixed-citation publication-type="other" xlink:type="simple">D&apos;amato, G., Cecchi, L., Bonini, S., Nunes, C., Annesi-Maesano, I., Behrendt, H., Liccardi, G., Popov, T., and Van Cauwenberge, P.: Allergenic pollen and pollen allergy in Europe, Allergy, 62, 976–990, 2007.</mixed-citation>
</ref>
<ref id="ref13">
<label>13</label><mixed-citation publication-type="other" xlink:type="simple">Day, J. H., Horak, F., Briscoe, M. P., Canonica, G. W., Fineman, S. M., Krug, N., Leynadier, F., Lieberman, P., Quirce, S., Takenaka, H., and Cauwenberge, P.: The role of allergen challenge chambers in the evaluation of anti-allergic medication: an international consensus paper, Clin. Exp. Allergy Rev., 6, 31–59, 2006.</mixed-citation>
</ref>
<ref id="ref14">
<label>14</label><mixed-citation publication-type="other" xlink:type="simple">DigitalGlobe Corporate: Quickbird spacecraft data sheet Longmont, Colorado, 2010.</mixed-citation>
</ref>
<ref id="ref15">
<label>15</label><mixed-citation publication-type="other" xlink:type="simple">Durham, O. C.: The Volumetric Incidence of Atmospheric Allergens, 3. Rate of Fall of Pollen Grains in Still Air, J. Allergy, 17, 70–78, 1946.</mixed-citation>
</ref>
<ref id="ref16">
<label>16</label><mixed-citation publication-type="other" xlink:type="simple">Ellermann, T., Andersen, H. V., Bossi, R., Christensen, J., Frohn, L. M., Geels, C., Kemp, K., Løfstrøm, P., Mogensen, B. B., and Monies, C.: Atmospheric Deposition 2006, NOVANA (in Danish: Atmosfærisk Deposition, NOVANA) National Environmental Research Institute, University of Aarhus, Roskilde, Denmark, 2007.</mixed-citation>
</ref>
<ref id="ref17">
<label>17</label><mixed-citation publication-type="other" xlink:type="simple">Emberlin, J., Mullins, J., Corden, J., Jones, S., Millington, W., Brooke, M., and Savage, M.: Regional variations in grass pollen seasons in the UK, long-term trends and forecast models, Clin. Exp. Allergy, 29, 347–356, 1999.</mixed-citation>
</ref>
<ref id="ref18">
<label>18</label><mixed-citation publication-type="other" xlink:type="simple">Emberlin, J., Jaeger, S., Dominguez-Vilches, E., Soldevilla, C. G., Hodal, L., Mandrioli, P., Lehtimäki, A. R., Savage, M., Spieksma, F. T., and Bartlett, C.: Temporal and geographical variations in grass pollen seasons in areas of western Europe: an analysis of season dates at sites of the European pollen information system, Aerobiologia, 16, 373–379, 2000.</mixed-citation>
</ref>
<ref id="ref19">
<label>19</label><mixed-citation publication-type="other" xlink:type="simple">European Commission: Image2000 and CLC2000 &lt;i&gt;Products and Methods&lt;/i&gt; European Commission, Joint Research Center (DG JRC), Institute for Environment and Sustainability, Land Management Unit, 21020 Ispra (VA), Italy, 2005.</mixed-citation>
</ref>
<ref id="ref20">
<label>20</label><mixed-citation publication-type="other" xlink:type="simple">Faegri, K. and Iversen, J.: Textbook of Pollen Analysis, John Wiley and Sons, 1992.</mixed-citation>
</ref>
<ref id="ref21">
<label>21</label><mixed-citation publication-type="other" xlink:type="simple">Fritz, S., Bartholome, E., Belward, A., Hartley, A., Stibig, H.-J., Eva, H., Mayaux, P., Bartalev, S., Latifovic, R., Kolmert, S., Roy, P. S., Agrawal, S., Bingfang, W., Wenting, X., Ledwith, M., Pekel, J.-F., Giri, C., Mücher, S., de Badts, E., Tateishi, R., Champeaux, J.-L., and Defourny, P.: The Global Land Cover for the Year 2000 European Commission, Joint Research Centre, 2003.</mixed-citation>
</ref>
<ref id="ref22">
<label>22</label><mixed-citation publication-type="other" xlink:type="simple">Fumanal, B., Chauvel, B., and Bretagnolle, F.: Estimation of pollen and seed production of common ragweed in France, Ann. Agr. Env. Med., 14, 233–236, 2007.</mixed-citation>
</ref>
<ref id="ref23">
<label>23</label><mixed-citation publication-type="other" xlink:type="simple">Garcìa-Mozo, H., Galán, C., Belmonte, J., Bermejo, D., Candau, P., Díaz de la Guardia, C., Elvira, B., Gutiérrez, M., Jato, V., Silva, I., Trigo, M. M., Valencia, R., and Chuine, I.: Predicting the start and peak dates of the Poaceae pollen season in Spain using process-based models, Agr. Forest Meteorol., 149, 256–262, 2009.</mixed-citation>
</ref>
<ref id="ref24">
<label>24</label><mixed-citation publication-type="other" xlink:type="simple">Geels, C., Andersen, H. V., Ambelas Skjøth, C., Christensen, J. H., Ellermann, T., Løfstrøm, P., Gyldenkærne, S., Brandt, J., Hansen, K. M., Frohn, L. M., and Hertel, O.: Improved modelling of atmospheric ammonia over Denmark using the coupled modelling system DAMOS, Biogeosciences, 9, 2625–2647, &lt;a href=&quot;http://dx.doi.org/10.5194/bg-9-2625-2012&quot;&gt;https://doi.org/10.5194/bg-9-2625-2012&lt;/a&gt;, 2012.</mixed-citation>
</ref>
<ref id="ref25">
<label>25</label><mixed-citation publication-type="other" xlink:type="simple">Goldberg, C., Buch, H., Moseholm, L., and Weeke, E. R.: Airborne Pollen Records in Denmark, 1977–1986, Grana, 27, 209–217, 1988.</mixed-citation>
</ref>
<ref id="ref26">
<label>26</label><mixed-citation publication-type="other" xlink:type="simple">GRASS Development Team: Geographic Resource Analysis Support System (GRASS) Software: Open source Geospatial Foundation Project, 2008.</mixed-citation>
</ref>
<ref id="ref27">
<label>27</label><mixed-citation publication-type="other" xlink:type="simple">Gregory, P. H.: The microbiology of the Atmosphere: Aylesbury, Bucks, UK, Leonard Hill, 1973.</mixed-citation>
</ref>
<ref id="ref28">
<label>28</label><mixed-citation publication-type="other" xlink:type="simple">Gyldenkærne, S., Ambelas Skjøth, C., Hertel, O., and Ellermann, T., A dynamical ammonia emission parameterization for use in air pollution models, J. Geophys. Res., 110, D07108, &lt;a href=&quot;http://dx.doi.org/10.1029/2004JD005459&quot;&gt;https://doi.org/10.1029/2004JD005459&lt;/a&gt;, 2005.</mixed-citation>
</ref>
<ref id="ref29">
<label>29</label><mixed-citation publication-type="other" xlink:type="simple">Helbig, N., Vogel, B., Vogel, H., and Fiedler, F.: Numerical modelling of pollen dispersion on the regional scale, Aerobiologia, 20, 3–19, 2004.</mixed-citation>
</ref>
<ref id="ref30">
<label>30</label><mixed-citation publication-type="other" xlink:type="simple">Hertel, O., Jensen, S. S., Hvidberg, M., Ketzel, M., Berkowicz, R., Sorensen, M., Loft, S., and Nielsen, O. R.: Exposure modeling – Using operational air pollution models, Toxicol. Lett., 164S, S15–S16, 2006.</mixed-citation>
</ref>
<ref id="ref31">
<label>31</label><mixed-citation publication-type="other" xlink:type="simple">Hertel, O., Ellermann, T., Palmgren, F., Berkowicz, R., Lofstrom, P., Frohn, L. M., Geels, C., Skjoth, C. A., Brandt, J., Christensen, J., Kemp, K., and Ketzel, M.: Integrated air-quality monitoring – combined use of measurements and models in monitoring programmes, Environ. Chem., 4, 65–74, 2007.</mixed-citation>
</ref>
<ref id="ref32">
<label>32</label><mixed-citation publication-type="other" xlink:type="simple">Hertel, O., Geels, C., Frohn, L. M., Ellermann, T., Skjoth, C. A., Lofstrom, P., Christensen, J. H., Andersen, H. V., and Peel, R. G.: Assessing atmospheric nitrogen deposition to natural and semi-natural ecosystems – Experience from Danish studies using the DAMOS system, Atmos. Environ., 66, 151–160, 2013.</mixed-citation>
</ref>
<ref id="ref33">
<label>33</label><mixed-citation publication-type="other" xlink:type="simple">Hirst, J. M.: An automatic volumetric spore trap, Ann. Appl. Biol., 39, 257–265, 1952.</mixed-citation>
</ref>
<ref id="ref34">
<label>34</label><mixed-citation publication-type="other" xlink:type="simple">Jato, V., Rodriguez-Rajo, F. J., Seijo, M. C., and Aira, M. J.: Poaceae pollen in Galicia (NW Spain): characterisation and recent trends in atmospheric pollen season, Int. J. Biometeorol., 53, 333–344, 2009.</mixed-citation>
</ref>
<ref id="ref35">
<label>35</label><mixed-citation publication-type="other" xlink:type="simple">Käpyla, M. and Penttinen, A.: An evaluation of the microscopial counting methods of the tape in Hirst-Burkard pollen and spore trap, Grana, 20, 131–141, 1981.</mixed-citation>
</ref>
<ref id="ref36">
<label>36</label><mixed-citation publication-type="other" xlink:type="simple">Laaidi, M.: Forecasting the start of the pollen season of Poaceae: evaluation of some methods based on meteorological factors, Int. J. Biometeorol., 45, 1–7, 2001.</mixed-citation>
</ref>
<ref id="ref37">
<label>37</label><mixed-citation publication-type="other" xlink:type="simple">Lillesand, T. M., Kiefer, R. W., and Chipman, J. W.: Remote Sensing and Image Interpretation, John Wiley &amp; Sons, NY, USA, 2007.</mixed-citation>
</ref>
<ref id="ref38">
<label>38</label><mixed-citation publication-type="other" xlink:type="simple">Mäkelä, E. M.: Size distinctions between Betula pollen types – A review, Grana, 35, 248–256, 1996.</mixed-citation>
</ref>
<ref id="ref39">
<label>39</label><mixed-citation publication-type="other" xlink:type="simple">Olesen, H. R., Løfstrøm, P., Berkowicz, R., and Jensen, A. B.: An Improved dispersion model for regulatory use – the OML model, Nato Chal. M, 29–38, 1992.</mixed-citation>
</ref>
<ref id="ref40">
<label>40</label><mixed-citation publication-type="other" xlink:type="simple">Orlanski, I.: A rational subdivision of scales for atmospheric processes, B. Am. Meteor. Soc. 56, 527–530, 1975.</mixed-citation>
</ref>
<ref id="ref41">
<label>41</label><mixed-citation publication-type="other" xlink:type="simple">Pashley, C., Fairs, A., Edwards, R., Bailey, J., Corden, J., and Wardlaw, A.: Reproducibility between counts of airborne allergenic pollen from two cities in the East Midlands, UK, Aerobiologia, 25, 249–263, 2009.</mixed-citation>
</ref>
<ref id="ref42">
<label>42</label><mixed-citation publication-type="other" xlink:type="simple">Pauleit, S. and Duhme, F.: Assessing the environmental performance of land cover types for urban planning, Landscape Urban Plan., 52, 1–20, 2000a.</mixed-citation>
</ref>
<ref id="ref43">
<label>43</label><mixed-citation publication-type="other" xlink:type="simple">Pauleit, S. and Duhme, F.: GIS assessment of Munich&apos;s Urban Forest structure for Urban planning, J. Arboriculture, 26, 133–141, 2000b.</mixed-citation>
</ref>
<ref id="ref44">
<label>44</label><mixed-citation publication-type="other" xlink:type="simple">Pauleit, S., Jones, N., Garcia-Martin, G., Garcia-Valdecantos, J. L., Riviere, L. M., Vidal-Beaudet, L., Bodson, M., and Randrup, T. B.: Tree establishment practice in towns and cities – Results from a European survey, Urban For. Urban Gree., 1, 83–96, 2002.</mixed-citation>
</ref>
<ref id="ref45">
<label>45</label><mixed-citation publication-type="other" xlink:type="simple">Petersen, N. and Munch, E.: Anvendelsen af aerobiologiske data, in: Pollen og Skimmelsvampesporer, Symposium om pollen og skimmelsvampesporers betydning ved allergiske sygdomme, edited by: Weeke, E. and Petersen, N. B., Scanticon, Århus, Denmark, 1981.</mixed-citation>
</ref>
<ref id="ref46">
<label>46</label><mixed-citation publication-type="other" xlink:type="simple">Pohl, F.: Die Pollenerzeugung der Windblüter, Eine vergleichende Untersuchiung mit Ausblicken auf den Bestäubungshaushalt tierblütiger Gewächse und die pollenanalytische Waldgeschichtsforshung, Beih. Bot. Centrallblatt, 56, 365–470, 1937.</mixed-citation>
</ref>
<ref id="ref47">
<label>47</label><mixed-citation publication-type="other" xlink:type="simple">Rantio-Lehtimaki, A., Koivikko, A., Kupias, R., Makinen, Y., and Pohjola, A.: Significance of Sampling Height of Airborne Particles for Aerobiological Information, Allergy, 46, 68–76, 1991.</mixed-citation>
</ref>
<ref id="ref48">
<label>48</label><mixed-citation publication-type="other" xlink:type="simple">Seinfeld, J. H. and Pandis, S. N.: Atmospheric Chemistry and Physics, John Wiley &amp; Sons Inc, New York, USA, 1326 pp., 1998.</mixed-citation>
</ref>
<ref id="ref49">
<label>49</label><mixed-citation publication-type="other" xlink:type="simple">Simpson, D., Winiwarter, W., Borjesson, G., Cinderby, S., Ferreiro, A., Guenther, A., Hewitt, C. N., Janson, R., Khalil, M. A. K., Owen, S., Pierce, T. E., Puxbaum, H., Shearer, M., Skiba, U., Steinbrecher, R., Tarrason, L., and Oquist, M. G.: Inventorying emissions from nature in Europe, J. Geophys. Res.-Atmos., 104, 8113–8152, 1999.</mixed-citation>
</ref>
<ref id="ref50">
<label>50</label><mixed-citation publication-type="other" xlink:type="simple">Skjøth, C. A.: Integrating measurements, phenological models and atmospheric models in Aerobiology – creating new concepts within aerobiological integrated monitoring and forecasting Faculty of Science, Copenhagen University, Ph.D. thesis, 123 pp., 2009.</mixed-citation>
</ref>
<ref id="ref51">
<label>51</label><mixed-citation publication-type="other" xlink:type="simple">Skjøth, C. A., Hertel, O., Gyldenkærne, S., and Ellermann, T.: Implementing a dynamical ammonia emission parameterization in the large-scale air pollution model ACDEP, J. Geophys. Res., 109, D06306, &lt;a href=&quot;http://dx.doi.org/10.1029/2003JD003895&quot;&gt;https://doi.org/10.1029/2003JD003895&lt;/a&gt;, 2004.</mixed-citation>
</ref>
<ref id="ref52">
<label>52</label><mixed-citation publication-type="other" xlink:type="simple">Skjøth, C. A., Sommer, J., Stach, A., Smith, M., and Brandt, J.: The long range transport of birch (&lt;i&gt;Betula&lt;/i&gt;) pollen from Poland and Germany causes significant pre-season concentrations in Denmark, Clin. Exp. Allergy, 37, 1204–1212, 2007.</mixed-citation>
</ref>
<ref id="ref53">
<label>53</label><mixed-citation publication-type="other" xlink:type="simple">Skjøth, C. A., Geels, C., Hvidberg, M., Hertel, O., Brandt, J., Frohn, L. M., Hansen, K. M., Hedegaard, G. B., Christensen, J., and Moseholm, L.: An inventory of tree species in Europe – an essential data input for air pollution modelling, Ecol. Modell., 217, 292–304, 2008a.</mixed-citation>
</ref>
<ref id="ref54">
<label>54</label><mixed-citation publication-type="other" xlink:type="simple">Skjøth, C. A., Sommer, J., Brandt, J., Hvidberg, M., Geels, C., Hansen, K., Hertel, O., Frohn, L., and Christensen, J.: Copenhagen – a significant source of birch (&lt;i&gt;Betula&lt;/i&gt;) pollen?, Int. J. Biometeorol., 52, 453–462, 2008b.</mixed-citation>
</ref>
<ref id="ref55">
<label>55</label><mixed-citation publication-type="other" xlink:type="simple">Skjøth, C. A., Smith, M., Brandt, J., and Emberlin, J.: Are the birch trees in Southern England a source of Betula pollen for North London?, Int. J. Biometeorol., 53, 75–86, 2009.</mixed-citation>
</ref>
<ref id="ref56">
<label>56</label><mixed-citation publication-type="other" xlink:type="simple">Skjøth, C. A., Smith, M., Sikoparija, B., Stach, A., Myszkowska, D., Kasprzyk, I., Radisic, P., Stjepanovic, B., Hrga, I., Apatini, D., Magyar, D., Paldy, A., and Ianovici, N.: A method for producing airborne pollen source inventories: An example of &lt;i&gt;Ambrosia &lt;/i&gt;(ragweed) on the Pannonian Plain, Agr. Forest Meteorol., 150, 1203–1210, 2010.</mixed-citation>
</ref>
<ref id="ref57">
<label>57</label><mixed-citation publication-type="other" xlink:type="simple">Smith, M. and Emberlin, J.: Constructing a 7-day ahead forecast model for grass pollen at north London, United Kingdom, Clin. Exp. Allergy, 35, 1400–1406, 2005.</mixed-citation>
</ref>
<ref id="ref58">
<label>58</label><mixed-citation publication-type="other" xlink:type="simple">Smith, M. and Emberlin, J.: A 30-day-ahead forecast model for grass pollen in north London, United Kingdom, Int. J. Biometeorol., 50, 233–242, 2006.</mixed-citation>
</ref>
<ref id="ref59">
<label>59</label><mixed-citation publication-type="other" xlink:type="simple">Smith, M., Emberlin, J., and Kress, A.: Examining high magnitude grass pollen episodes at Worcester, United Kingdom, using back-trajectory analysis, Aerobiologia, 21, 85–94, 2005.</mixed-citation>
</ref>
<ref id="ref60">
<label>60</label><mixed-citation publication-type="other" xlink:type="simple">Smith, M., Skjøth, C. A., Myszkowska, D., Uruska, A., Malgorzata, P., Stach, A., Balwierzg, Z., Chlopek, K., Piotrowska, K., Kasprzyk, I., and Brandt, J.: Long-range transport of &lt;i&gt;Ambrosia &lt;/i&gt;pollen to Poland, Agr. Forest Meteorol., 148, 1402–1411, 2008.</mixed-citation>
</ref>
<ref id="ref61">
<label>61</label><mixed-citation publication-type="other" xlink:type="simple">Smith, M., Emberlin, J., Stach, A., Rantio-Lehtimaki, A., Caulton, E., Thibaudon, M., Sindt, C., Jager, S., Gehrig, R., Frenguelli, G., Jato, V., Rajo, F. J. R., Alcazar, P., and Galan, C.: Influence of the North Atlantic Oscillation on grass pollen counts in Europe, Aerobiologia, 25, 321–332, 2009.</mixed-citation>
</ref>
<ref id="ref62">
<label>62</label><mixed-citation publication-type="other" xlink:type="simple">Sofiev, M., Siljamo, P., Ranta, H., and Rantio-Lehtimaki, A.: Towards numerical forecasting of long-range air transport of birch pollen: theoretical considerations and a feasibility study, Int. J. Biometeorol., 50, 392–402, 2006a.</mixed-citation>
</ref>
<ref id="ref63">
<label>63</label><mixed-citation publication-type="other" xlink:type="simple">Sofiev, M., Siljamo, P., Valkama, I., Ilvonen, M., and Kukkonen, J.: A dispersion modelling system SILAM and its evaluation against ETEX data, Atmos. Environ., 40, 674–685, 2006b.</mixed-citation>
</ref>
<ref id="ref64">
<label>64</label><mixed-citation publication-type="other" xlink:type="simple">Sofiev, M., Belmonte, J., Gehrig, R., Izquierdo, R., Smith, M., Dahl, A., and Siljamo, P.: Airborne Pollen Transport, in: Allergenic Pollen: A Review of the Production, Release, Distribution and Health Impacts, edited by: Sofiev, M. and Bergmann, K.-C., Springer, The Netherlands, 127–159, &lt;a href=&quot;http://dx.doi.org/10.1007/978-94-007-4881-1_5&quot;&gt;https://doi.org/10.1007/978-94-007-4881-1_5&lt;/a&gt;, 2013.</mixed-citation>
</ref>
<ref id="ref65">
<label>65</label><mixed-citation publication-type="other" xlink:type="simple">Sommer, J. and Rasmussen, A.: Measurements of pollen and spores in Denmark 2009 (in Danish: Pollen- og sporemålinger i Danmark sæsonen 2009) The Astma-Allergy Association, Universitetsparken 4, 4000 Roskilde, Denmark, 2009.</mixed-citation>
</ref>
<ref id="ref66">
<label>66</label><mixed-citation publication-type="other" xlink:type="simple">Sommer, S. G., Østergård, H. S., Løfstrøm, P., Andersen, H. V., and Jensen, L. S.: Validation of model calculation of ammonia deposition in the neighbourhood of a poultry farm using measured NH&lt;sub&gt;3&lt;/sub&gt; concentrations and N deposition, Atmos. Environ., 43, 915–-920, 2009.</mixed-citation>
</ref>
<ref id="ref67">
<label>67</label><mixed-citation publication-type="other" xlink:type="simple">Sorensen, M., Autrup, H., Moller, P., Hertel, O., Jensen, S. S., Vinzents, P., Knudsen, L. E., and Loft, S.: Linking exposure to environmental pollutants with biological effects, Mutat. Res.-Rev. Mutat., 544, 255–271, 2003.</mixed-citation>
</ref>
<ref id="ref68">
<label>68</label><mixed-citation publication-type="other" xlink:type="simple">Stach, A., Smith, M., Skjøth, C. A., and Brandt, J.: Examining &lt;i&gt;Ambrosia &lt;/i&gt;pollen episodes at Poznañ (Poland) using back-trajectory analysis, Int. J. Biometeorol., 51, 275–286, 2007.</mixed-citation>
</ref>
<ref id="ref69">
<label>69</label><mixed-citation publication-type="other" xlink:type="simple">Stach, A., Smith, M., Baena, J. C. P., and Emberlin, J.: Long-term and short-term forecast models for Poaceae (grass) pollen in Poznan, Poland, constructed using regression analysis, Environ. Exp. Bot., 62, 323–332, 2008.</mixed-citation>
</ref>
<ref id="ref70">
<label>70</label><mixed-citation publication-type="other" xlink:type="simple">US-EPA: AERMOD: Latest Features and Evaluation Results U.S. Environmental Protection Agency, Office of AirQuality Planning and Standards, Emissions Monitoring and Analysis Division, Research Triangle Park, NC27711, USA, 2003.</mixed-citation>
</ref>
<ref id="ref71">
<label>71</label><mixed-citation publication-type="other" xlink:type="simple">Weeke, E.: Behandling af pollen- og skimmelssporeallergi, in: Pollen og Skimmelsvampesporer, Symposium om pollen og skimmelsvampesporers betydning ved allergiske sygdomme, edited by: Weeke, E. and Petersen, N. B., Scanticon, Århus, Denmark, 1981.</mixed-citation>
</ref>
<ref id="ref72">
<label>72</label><mixed-citation publication-type="other" xlink:type="simple">WHO: Phenology and Human Health: Allergic Disorders WHO Regional Office for Europe, Scherfigsvej 8, 2100, Copenhagen Ø, Denmark, 2003.</mixed-citation>
</ref>
<ref id="ref73">
<label>73</label><mixed-citation publication-type="other" xlink:type="simple">Zink, K., Vogel, H., Vogel, B., Magyar, D., and Kottmeier, C.: Modeling the dispersion of &lt;i&gt;Ambrosia artemisiifolia&lt;/i&gt; L. pollen with the model system COSMO-ART, Int. J. Biometeorol., 56, 669–680, &lt;a href=&quot;http://dx.doi.org/10.1007/s00484-011-0468-8&quot;&gt;https://doi.org/10.1007/s00484-011-0468-8&lt;/a&gt;, 2012.</mixed-citation>
</ref>
</ref-list>
</back>
</article>