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Related Experiment Video

Updated: May 26, 2026

In Vitro Rearing of Solitary Bees: A Tool for Assessing Larval Risk Factors

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Pollen counts and suicide rates. Association not replicated.

J M Woo¹, R D Gibbons, C A Rogers

¹Mood and Anxiety Program (MAP), Department of Psychiatry, University of Maryland School of Medicine, 685 W. Baltimore St., Baltimore, MD 21201, USA.

Acta Psychiatrica Scandinavica

|December 20, 2011

Summary

This study found no link between pollen counts and suicide rates within counties. The previously suggested association between pollen and suicide rates may be due to socioeconomic factors.

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Area of Science:

Environmental Epidemiology
Public Health
Psychiatry

Background:

Previous research suggested a correlation between airborne pollen levels and county-level suicide rates in the U.S.
The potential influence of environmental factors on mental health outcomes warrants further investigation.

Purpose of the Study:

To validate the previously reported association between pollen counts and suicide rates across the continental United States.
To examine this relationship over time and space, considering various demographic and socioeconomic factors.

Main Methods:

Analysis of suicide rates (N=120,076) and airborne pollen data from 42 U.S. counties (1999-2002).
Statistical evaluation included adjustments for quarter, age, sex, race, rural/urban status, psychiatrist availability, and median household income.
County-level effects were analyzed separately as between-county and within-county variations.

Main Results:

No statistically significant within-county association was detected between pollen counts and suicide rates.
Between-county associations for grass and ragweed pollen lost significance after controlling for socioeconomic and demographic variables.
The observed relationship between pollen and suicide rates may be confounded by factors such as income and access to mental health services.

Conclusions:

The previously reported association between pollen levels and suicide rates requires re-evaluation.
Socioeconomic confounders likely play a significant role in the observed relationship.
Further research is needed to clarify the complex interplay between environmental factors, socioeconomic status, and suicide risk.