Is pollen a pollutant? (by Diego Fdez-Sevilla)

Is pollen a pollutant? (by Diego Fdez-Sevilla)

Photo: Brooke Novak

This is a question that I have received and here I present the answer that I have given so I would like to share my thoughts about it.

Pollen from grasses, trees, and weeds is the wonderful substance that allows plants to reproduce, but it is also responsible for numerous allergic reactions people experience. Although pollen is found naturally in the air, human activities and choices can increase the amount of pollen in our air, and in turn, can cause people to have more severe allergic reactions. Because human activities can increase the amount of pollen in our air and cause adverse health effects, some people view pollen as an air pollutant.

People commonly treat their allergies by avoiding situations where they might have an attack, by using dehumidifiers and air filters. But, by becoming familiar with the source of you allergies, you can also begin to make choices that can prevent the severity of your attacks. The number of pollen particles released into the air are studied and measured by the field of “Aerobiology” performing a “pollen count”. Pollen counts tell you the number of pollen grains per cubic meter of air. They can also tell you which tree, grass, or plant the pollen came from. Different plants and trees produce different amounts of pollen and knowing which plants are the largest contributors to your allergies can influence what flowers and trees you and your community chose to plant.

I think that there is a good explanation about the situation nowadays in this site which can be applied not only to USA but worldwide:

Air Pollution: Smog, Smoke and Pollen: “Ozone smog forms when pollution from vehicles, nrdc_org websitefactories, and other sources reacts with sunlight and heat. Increasing temperatures speed this process and result in more smog. Added to the mix are ragweed and other allergens in the air — which are expected to worsen as rising carbon dioxide levels cause plants to produce more pollen.”

As part of the topic I would like to mention that the European Commission developed a new regulation for Air Quality standards in 2009 which did not include the atmospheric monitoring of biological particles such as pollen and spores despite of being of high relevance in the health impact assessment for atmospheric environments outdoors.

The justification behind this decision was that their presence in the atmosphere was not the result of man-made activity. However, there is enough evidence to support that the impact that pollen and spores concentration in the air has in our health after exposure is the result of combining factors such as:

  • an increased presence of those particles in our atmosphere due to man induced changes in climatic conditions (global climate change and strong impact of urbanization increasing the so called “heat island effect”),
  • the increased presence of ornamental plant species in our communities with recognized allergenic pollen as a result of arbitrary decisions and,
  • the increasing allergenic behaviour of pollen as a result of interacting with man-made pollutants present in the atmosphere.

If we want to characterize the hazardous potential of the atmospheric load in our health I would consider relevant to monitor altogether pollen with CO2, Ozone, SOx, NOx, VOCs, etc as health impact pollutants. Furthermore, it is of my believe that measures taken to monitor pollen atmospheric concentrations and allergenic conditions would allow to implement such information in health strategic decision making (bringing awareness to public and medical doctors to adopt measures beforehand). And also, it would contribute to evaluate the impact of human decision making which could worsen or improve atmospheric environmental conditions. (check also

Considerations by the EPA about outdoor air pollution includes in their assessments the role played by pollen from plants, crops and weeds since it may worsen chronic respiratory diseases, such as asthma.

For a more in depth reading I would suggest the following article (notice it is from 1991 so you can see this topic comes from some time ago already. The publications coming after confirm and increase the data):

The significance of air pollution in aerobiology. M. D. Lebowitz, M. K. O’rourke Grana Vol. 30, Iss. 1, 1991

Also, I leave you articles in which it is quantified the impact of anthropogenic climate change on pollen concentrations and the impact of ornamental plantings. They are just an example of scientific input in the field mentioned. Any person interested in further research can follow references and citations from and, including, these studies.

About the impact of anthropogenic climate change on pollen concentrations:

* Review of the Impact of Climate Variability and Change on Aeroallergens and Their Associated Effects (Final Report) by the EPA.

* An article in which I am co-author:

Assessment between pollen seasons in areas with different urbanization level related to local vegetation sources and differences in allergen exposure. Rodríguez-Rajo, F.; Fdez-Sevilla, D.; Stach, A(†). & Jato, V. (2010). Aerobiologia, Vol 26-1, 1-14.

About the impact of ornamental plantings.

*Urban green zones and related pollen allergy: A review. Some guidelines for designing spaces with low allergy impact. Paloma Cariñanos, Manuel Casares-Porcel. Landscape and Urban Planning, Volume 101, Issue 3, 15 June 2011, Pages 205–214.


About Diego Fdez-Sevilla, PhD.

Citing This Site "Title", published online "Month"+"Year", retrieved on "Month""Day", "Year" from By Diego Fdez-Sevilla, PhD. More guidance on citing this web as a source can be found at NASA webpage:! DOIs can be generated on demand by request at email: d.fdezsevilla(at) for those publications missing at the ResearchGate profile vinculated with this project. **Author´s profile: Born in 1974. Bachelor in General Biology, Masters degree "Licenciado" in Environmental Sciences (2001, Spain). PhD in Aerobiology (2007, UK). Lived, acquired training and worked in Spain, UK, Germany and Poland. I have shared the outcome from my work previous to 2013 as scientific speaker in events held in those countries as well as in Switzerland and Finland. After 12 years performing research and working in institutions linked with environmental research and management, in 2013 I found myself in a period of transition searching for a new position or funding to support my own line of research. In the current competitive scenario, in order to demonstrate my capacities instead of just moving my cv waiting for my next opportunity to arrive, I decided to invest my energy and time in opening my own line of research sharing it in this blog. In March 2017 the budget reserved for this project has ended and its weekly basis time frame discontinued until new forms of economic and/or institutional support are incorporated into the project. The value of the data and the original nature of the research presented in this platform and at LinkedIn has proved to be worthy of consideration by the scientific community as well as for publication in scientific journals. However, without a position as member of an institution, it becomes very challenging to be published. I hope that this handicap do not overshadow the value of my achievements and that the Intellectual Property Rights generated with the license of attribution attached are respected and considered by the scientist involved in similar lines of research. **Any comment and feedback aimed to be constructive is welcome as well as any approach exploring professional opportunities to be part of.** In this blog I publish pieces of research focused on addressing relevant environmental questions. Furthermore, I try to break the barrier that academic publications very often offer isolating scientific findings from the general public. In that way I address those topics which I am familiar with, thanks to my training in environmental research, making them available throughout my posts. (see "Framework and Timeline" for a complete index). At this moment, 2017, I am living in Spain with no affiliation attachments. Free to relocate geographically worldwide. If you feel that I could be a contribution to your institution, team and projects don´t hesitate in contact me at d.fdezsevilla (at) or consult my profile at LinkedIn, ResearchGate and Also, I'd appreciate information about any opportunity that you might know and believe it could match with my aptitudes. The conclusions and ideas expressed in each post as part of my own creativity are part of my Intellectual Portfolio and are protected by Intellectual Property Laws. Licensed under Creative Commons Attribution-NonCommercial conditions. In citing my work from this website, be sure to include the date of access. (c)Diego Fdez-Sevilla, PhD, 2017. Filling in or Finding Out the gaps around. Publication accessed 20YY-MM-DD at
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2 Responses to Is pollen a pollutant? (by Diego Fdez-Sevilla)

  1. Pingback: Press Release: “Effects of air pollution on European ecosystems” EEA report. (by Diego Fdez-Sevilla) | diego fdez-sevilla

  2. Pingback: Effects of ecosystem’s degradation on natural air pollutants. (by Diego Fdez-Sevilla) | diego fdez-sevilla

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