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Decrease in Ambient Polycyclic Aromatic Hydrocarbon Concentrations in California's San Joaquin Valley 2000-2019.

Elizabeth M Noth¹, Fred Lurmann², Charles Perrino¹

¹Division of Environmental Health Sciences, School of Public Health, University of California, Berkeley, 2121 Berkeley Way #5302, Berkeley, CA 94720-7360.

Atmospheric Environment (Oxford, England : 1994)

|September 28, 2020

Summary

This summary is machine-generated.

Airborne polycyclic aromatic hydrocarbon (PAH) concentrations in Fresno, California, dramatically decreased from 2000-2004 and remained low through 2019. This significant reduction is primarily linked to decreased agricultural and biomass burning.

Keywords:

California agricultural burning air pollution biomass burning polycyclic aromatic hydrocarbons residential wood burning traffic-related air pollution

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Published on: December 23, 2022

Area of Science:

Environmental Science
Air Quality Monitoring
Public Health

Background:

Polycyclic aromatic hydrocarbons (PAHs) are significant air pollutants linked to adverse health outcomes.
Understanding long-term trends in PAH concentrations is crucial for assessing public health risks in urban and industrial areas.
The San Joaquin Valley faces unique air quality challenges due to its geography and diverse emission sources.

Purpose of the Study:

To evaluate the trends of airborne polycyclic aromatic hydrocarbon (PAH) concentrations in Fresno, California, over a 19-year period (2000-2019).
To identify potential sources responsible for observed changes in PAH levels.
To inform public health strategies related to air pollution exposure in the San Joaquin Valley.

Main Methods:

Analysis of 19 years of continuous and filter-based PAH concentration data from a central air monitoring site in Fresno.
Statistical evaluation of temporal trends in both particle-bound and individual PAHs.
Correlation analysis with potential emission sources including industrial, on-road vehicle, residential wood burning, and agricultural/biomass waste burning.

Main Results:

A dramatic decline in outdoor airborne PAH concentrations was observed between 2000 and 2004, with levels maintained through 2019.
This decline was evident in both continuous particle-bound PAHs (62% reduction by 2017-2018) and filter-based individual PAHs (82% reduction by 2001-2018).
The most significant reduction in PAHs coincided with a decrease in agricultural and biomass waste burning in Fresno and Madera Counties.

Conclusions:

Significant reductions in airborne PAH concentrations have been achieved in Fresno, California.
The primary driver for the observed PAH decline appears to be reduced agricultural and biomass waste burning.
Continued monitoring and source attribution are essential for managing air quality and protecting public health.