Emissions from fossil fuels are the main problem, the report cited Jane Hall, from California State University, Fullerton, as saying. "We need to find ways to clean up diesel, find ways to make transportation more efficient," Hall said. "A lot of it is just reducing combustion of fossil fuels in these two basins."
Around Los Angeles the cost of air pollution tops $1,250 per person per year and in the San Joaquin Valley, California agricultural centre, it is more than $1,600 per person annually, the report said.
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