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With the reddish-orange skies and smoke-filled air, Californians who had previously never heard of PM2.5 pollution are quickly learning about the Air Quality Index and what they need to do to protect ...

Fans and air-conditioners, if you use them right, can help. By Dani Blum An air purifier, like one that uses a HEPA filter, is the best way to improve the quality of your indoor air — but if you are ...