he Winter Spare the Air season runs from November 1, 2009, through February 28, 2010. During this period, it will be illegal to burn wood, pellets, or manufactured fire logs when a Winter Spare the Air Alert is issued.
When our morning forecast predicts that concentrations of PM2.5 will exceed the national health-based standard, the Air District will issue a Winter Spare the Air Alert. Winter Spare the Air Alerts will be posted on our Spare the Air home page and on the Air District’s www.baaqmd.gov home page.
In the wintertime, fine particulate matter (PM2.5) becomes the pollutant with the greatest impact on air quality. Fine particulates can bypass the body’s natural defenses, penetrating deeply into the lungs and even passing into the bloodstream. Prolonged exposure to the fine particulates in wood smoke has been linked with aggravated asthma, lung and heart disease, and increased mortality rates. Wood burning in fireplaces and woodstoves creates about one-third of the winter particulate matter air pollution in the Bay Area.
http://www.sparetheair.org/