San Joaquin Valley Unified Air Pollution District

This page updated February 11, 2003.

General Background

About nine percent of California’s population, or 3 million people, live in the San Joaquin Valley, while pollution sources in the region account for about 14 percent of the total statewide criteria pollutant emissions.

In contrast to other California areas, air quality in the San Joaquin Valley is not dominated by emissions from one large urban area. Instead, there are a number of moderately sized urban areas spread along the main axis of the Valley; chief among them are Fresno, Bakersfield, Stockton and Modesto. This wide distribution of emissions complicates the challenge faced by air quality control agencies.

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