Evidence map›Paper›PMID 33558232›Full record

ArticleProceedings of the National Academy of Sciences of the United States of America2021

Anthropogenic climate change is worsening North American pollen seasons.

William R L Anderegg, John T Abatzoglou, Leander D L Anderegg, Leonard Bielory, Patrick L Kinney, Lewis Ziska

Abstract read
In one paragraph

Article in Proceedings of the National Academy of Sciences of the United States of America, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 85 papers, 2 of them syntheses that pooled it.

0numbers the graph read from it
0cells of the map it votes in
85citing papers in PubMed, 2 pooled it
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

85 citing papers in PubMed, 2 syntheses or guidelines pooled it.

  1. Pooled it
  2. Pooled it
  3. Elevated COAllergy · 2026
    Article
  4. Article
  5. Respiratory Emergencies in Disasters: A Narrative Review.Thoracic research and practice · 2026
    Article
  6. Review
  7. Article
  8. Article
  9. Article
  10. Review
  11. Article
  12. Evolution of IgE sensitization profiles toThe World Allergy Organization journal · 2026
    Article
  13. The Impact of Environmental Pollution and Climate Change on Allergic Rhinitis and Lung Diseases.World journal of otorhinolaryngology - head and neck surgery · 2026
    Review
  14. Review
  15. Review
  16. Article
  17. Article
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  19. Article
  20. Article

25 more citing papers are in PubMed but not listed here.

4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

6 authors.

William R L AndereggSchool of Biological Sciences, University of Utah, Salt Lake City, UT 84112; Anderegg@utah.edu.ORCID 0000-0001-6551-3331
John T AbatzoglouManagement of Complex Systems Department, University of California, Merced, CA 95343.ORCID 0000-0001-7599-9750
Leander D L AndereggDepartment of Integrative Biology, University of California, Berkeley, CA 94720.ORCID 0000-0002-5144-7254
Leonard BieloryCenter for Environmental Prediction, Rutgers University, New Brunswick, NJ 08854.ORCID 0000-0002-6090-4920
Patrick L KinneySchool of Public Health, Boston University, Boston, MA 02118.ORCID 0000-0003-2801-1003
Lewis ZiskaMailman School of Public Health, Columbia University, New York, NY 10032.ORCID 0000-0002-6220-1620

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

Airborne pollen has major respiratory health impacts and anthropogenic climate change may increase pollen concentrations and extend pollen seasons. While greenhouse and field studies indicate that pollen concentrations are correlated with temperature, a formal detection and attribution of the role of anthropogenic climate change in continental pollen seasons is urgently needed. Here, we use long-term pollen data from 60 North American stations from 1990 to 2018, spanning 821 site-years of data, and Earth system model simulations to quantify the role of human-caused climate change in continental patterns in pollen concentrations. We find widespread advances and lengthening of pollen seasons (+20 d) and increases in pollen concentrations (+21%) across North America, which are strongly coupled to observed warming. Human forcing of the climate system contributed ∼50% (interquartile range: 19-84%) of the trend in pollen seasons and ∼8% (4-14%) of the trend in pollen concentrations. Our results reveal that anthropogenic climate change has already exacerbated pollen seasons in the past three decades with attendant deleterious effects on respiratory health.

Indexed as

Climate ChangeSeasonsAir PollutionHumansNorth AmericaPlantsPollenRhinitis, Allergic, Seasonalattributionclimate changedetectionEarth system modelrespiratory health

Identifiers

PMID33558232
PMCPMC7896283

What OpenQuestion holds

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LicenceCC BY
Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.