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Composition and Distribution Analysis of Bioaerosols Under Different Environmental Conditions

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Predicting Airborne Particle Levels Aboard Washington State School Buses.

Sara D Adar¹, Mark Davey, James R Sullivan

¹Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, WA 98105.

Atmospheric Environment (Oxford, England : 1994)

|November 6, 2008

Summary

Children riding school buses are exposed to high levels of fine particulate matter (PM2.5) pollution, significantly exceeding ambient and roadway levels. This in-cabin pollution is influenced by bus characteristics and traffic, impacting children's respiratory health.

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Published on: May 22, 2020

Area of Science:

Environmental Health
Epidemiology
Air Pollution Science

Background:

School buses are a significant source of childhood air pollution exposure.
Quantifying fine particulate matter (PM2.5) on school buses is crucial for health impact studies.
Previous research has rarely quantified school bus air pollution.

Purpose of the Study:

To characterize fine particulate matter (PM2.5) concentrations aboard school buses.
To investigate the sources and influencing factors of onboard PM2.5.
To inform studies on the respiratory health impacts of emission-reducing retrofits.

Main Methods:

Continuous PM2.5 data collection during 85 trips on 43 school buses.
Simultaneous data collection from lead vehicles to assess roadway concentrations.
Development of regression models to analyze PM2.5 levels and influencing factors.

Main Results:

School bus PM2.5 concentrations (21 μg/m³) were 4x higher than ambient and 2x higher than roadway levels.
An average of 7 μg/m³ of PM2.5 originated from the buses' own emission sources.
Bus age and diesel oxidative catalysts influenced onboard PM2.5, alongside roadway concentrations.

Conclusions:

Children experience elevated air pollution exposure while riding school buses.
In-cabin school bus air pollution is higher than surrounding roadway levels.
Bus characteristics significantly influence the level of air pollution exposure for children.