Ambient and Emission Trends of Toxic Air Contaminants in California

Environmental Science & Technology
Ralph PropperDongmin Luo

Abstract

After initiating a toxic air contaminant (TAC) identification and control program in 1984, the California Air Resources Board adopted regulations to reduce TAC emissions from cars, trucks, stationary sources, and consumer products. This study quantifies ambient concentration and emission trends for the period 1990-2012 for seven TACs that are responsible for most of the known cancer risk associated with airborne exposure in California. Of these seven, diesel particulate matter (DPM) is the most important; however DPM is not measured directly. Based on a novel surrogate method, DPM concentrations declined 68%, even though the state's population increased 31%, diesel vehicle-miles-traveled increased 81%, and the gross state product (GSP) increased 74%. Based on monitoring data, concentrations of benzene, 1,3-butadiene, perchloroethylene, and hexavalent chromium declined 88-94%. Also, the ambient and emissions trends for each of these four TACs were similar. Furthermore, these declines generally occurred earlier in California than elsewhere. However, formaldehyde and acetaldehyde, which are formed in the air photochemically from volatile organic compounds (VOCs), declined only 20-21%. The collective cancer risk from exposure to th...Continue Reading

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Citations

Apr 1, 2017·The Journal of Physical Chemistry. a·Alexis J Eugene, Marcelo I Guzman
Oct 20, 2017·International Journal of Environmental Research and Public Health·Sheena E MarteniesStuart A Batterman
Mar 29, 2018·Journal of the Air & Waste Management Association·H Christopher Frey
Feb 27, 2016·Environmental Health Insights·William VizueteRebecca C Fry
Jan 8, 2019·Particle and Fibre Toxicology·Keith Morris-SchafferDeborah A Cory-Slechta
Jan 25, 2017·International Journal of Environmental Research and Public Health·Lexuan ZhongStuart Batterman
Dec 9, 2020·Faraday Discussions·Luisa T Molina
Dec 10, 2020·Environmental Science & Technology·Scott SamuelsenJack Brouwer
Sep 25, 2021·Environmental Science & Technology·James F Pankow

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