Since the state implemented a ban on burning wood and fuel during certain times, there have been fewer pollution-related deaths registered in California, it has been claimed.
A study, compiled by health and science advisor for the San Joaquin Valley Air Pollution Control District David Lighthall, found that there have been 50 fewer premature deaths in the area since wood-burning restrictions were implemented.
Further restrictions on the burning of wood in California were introduced in October of this year, resulting in a total of 22 days during November and December being declared as non-burning.
Mr Lighthall commented: "Our findings provide the district as well as the public with scientific assurance that substantial future improvements in public health will result."
The report suggested that around $500 million (£345 million) a year can be saved in healthcare costs as a result of fewer deaths.
Elsewhere in the US, the air of all 13 districts of the state of Indiana was declared to contain higher than recommended levels of pollution by the Environmental Protection Agency.
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