| 2011 Dec. 9: San Francisco Bay Area: Third Air Alert Day in a Row Patch.com Winter air pollution is mainly caused by particulates or soot from wood smoke. Smoke from wood-burning fires is linked to illnesses such as asthma, … |
| Friday marks third consecutive Spare the Air day this week Daily Californian The alerts are issued by the air district when the concentration of particulate matter in the air could violate state and national health standards. |
| Third Spare The Air Day In Place Today Patch.com By Rebecca Rosen Lum Today is the third Spare the Air alert this week; burning wood is … about one-third of the harmful particulate pollution in the air. … |
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