Pollution
Hemmed in by mountains and rarely having strong winds to disperse smog, the San Joaquin Valley has long suffered from some of the United States' worst air pollution. This pollution, exacerbated by stagnant weather, comes mainly from diesel and gasoline fueled vehicles and agricultural operations. Population growth has caused the San Joaquin Valley to rank with Los Angeles and Houston in most measures of air pollution. Only the Inland Empire region east of Los Angeles has worse overall air quality, and the San Joaquin Valley led the nation in 2004 in the number of days with quantities of ozone considered unhealthy by the Environmental Protection Agency.
Although industrial activity, as well as driving, occurs year-round, the air pollution is worse in the winter.
Groundwater purity is an ongoing issue in this valley including the Turlock Basin. San Joaquin County has better air quality than any other region in the San Joaquin Valley, while the Sacramento region and Stanislaus County have the worst.
Less water is due to Federal restrictions on shallow water irrigation which results in concentrated Water pollution. Air pollution is not properly diluted with adequate water supply. Lack of adequate irrigation presents another significant challenge to food production capability in the valley. Because of federal restrictions on irrigation, Soil salination is no longer diluted with adequate moisture in fertile areas. Reduced irrigation has significantly reduced the viability of some of the valley's most fertile tracts, especially those in the Tulare lake bed.
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