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Air Quality & Environmental Health

Critics dust off EPA Panel; plan would roll back monitoring of soot, dust in small cities.

SAN FRANCISCO - Carolina Simunovic on Wednesday gave federal bureaucrats a live reason why San Joaquin Valley residents worry about a proposed rollback of dust rules for rural residents. The Fresno-area resident held her 7-month-old daughter, Isabella, in front of a U.S. Environmental Protection Agency panel and asked: "How much can her little lungs take? What you're proposing is a crime against the San JoaquinValley."
MARK GROSSI - 03/09/06
View the complete article at www.fresnobee.com


Photo Gallery: Clean Air Action Day 2005 (The Central Valley Air Quality Coalition hits our State Capital!)

Want to stay informed? Click here to subscribe to our new Air Quality Announcement listserve!

The San Joaquin Valley has the most polluted air in the country. The toxic air in the Valley endangers the health of its residents, retards the growth of its crops, and threatens the overall quality of life in the region.

What is air pollution?

In the San Joaquin Valley, air pollution comes from two main sources: ozone and particulate matter (PM).

Ozone is a colorless, odorless gas comprised of three oxygen atoms. Ozone is found naturally in the earth’s stratosphere (the Ozone layer) where it absorbs the sun’s harmful rays. But ozone closer to the earth’s surface is dangerous, and more commonly referred to as smog.

Particulate Matter (PM) is a generic term used to describe a mixture of fine airborne solid particles and liquid droplets that are present in the air. These tiny particles are invisible to the naked eye, but can cause serious health problems.

Where does air pollution come from?

Ozone (or smog) is created by chemical reactions and sunlight. Pollutants like nitrogen oxides (NOx) and volatile organic compounds (VOCs) are called “ozone precursors.” They combine in the presence of hot, stagnant, sunny weather to create ozone (or smog). Ozone precursors in the San Joaquin Valley come from cars, trucks, buses, agricultural equipment, dairies, and consumer products such as paint and even hair spray.

PM comes from agricultural operations, industrial processes, combustion of wood and fossil fuels, construction and demolition activities, and road dust kicked into the air. Windblown dust and wildfires also contribute to the problem. Diesel soot is of particular concern in the Valley, due to the high volume of trucks that use Highway 99.

The geography of the San Joaquin Valley acts as a trap for these pollutants. Surrounding mountains trap airborne pollutants near the Valley floor where people live and breathe. Population growth also contributes to the problem, as more people bring more activities that contribute to poor air quality.

Contrary to popular belief, the majority of pollution in the San Joaquin Valley does not come from outside the area. Air pollution transported from the San Francisco Bay and Sacramento areas account for approximately 27% of the total emissions in the Northern portion of the Valley (San Joaquin, Stanislaus, and Merced Counties). In the Central region (Fresno, Madera and Kings Counties), the percentage drops to 11%, and in the south valley (Kern and Tulare Counties), transported air pollution accounts for only 7% of the total problem.

How does air pollution harm us?

Air pollution kills more people in the San Joaquin Valley than homicide. More than 2,200 people have died prematurely over the past two years because of our dirty air. One in six children in Fresno County has asthma- that’s twice the national average and the highest rate in the state.

Air pollution harms our economy as well, decreasing crop yields and increasing public health expenditures.

Who monitors air pollution?

The San Joaquin Valley Air Pollution Control District regulates stationary sources of pollution in the region. The California Air Resources Board is in charge of setting State standards. The Environmental Protection Agency is in charge of monitoring national standards.


Where can I go for more information?

Central Valley Air Quality Coalition (CVAQ)

Union of Concerned Scientists report: Clearing the Air in the San Joaquin Valley

Steven and Michele Kirsch Foundation

San Joaquin Valley Air Pollution Control District

Daily Air Quality Status (SJVAPCD/CARB data)

California Air Resources Board

Environmental Protection Agency


Download air quality and environmental health resources, in Adobe Acrobat PDF format below.

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Air Quality and Environmental Health Resources

 Topic:  Click here to download:
Air Pollution 101 presentation, in PowerPoint format (Copyright 2005 Fresno Metro Ministry) Download this file
Air Pollution 101 presentation (Spanish), in PowerPoint format (Copyright 2005 Fresno Metro Ministry) Download this file
Air Pollution 101 presentation, in HTML (Copyright 2005 Fresno Metro Ministry) View this presentation
DIEsel Pollution in the San Joaquin Valley, in PDF format (Copyright 2005 Fresno Metro Ministry) Download this file
Health Impacts from Diesel Pollution in the SJV, in HTML View this spreadsheet

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