Health watch in effect Friday for Maricopa County - MyFoxAustin.com | KTBC Fox 7 | News, Weather, Sports

Health watch in effect Friday for Maricopa County

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Phoenix skyline under a layer of smog. (File) Phoenix skyline under a layer of smog. (File)

PHOENIX (AP) - A health watch for particulates in the air is in effect Friday for Maricopa County.

Environmental quality regulators say open burning and use of wood burning fireplaces are generally prohibited. And people with respiratory problems are advised to avoid heavy or prolonged outdoor exertion.

Particulates are extremely small solid particles and liquid droplets that come from automobile exhaust, burning and dust. High levels typically occur when the air is stagnant.

Copyright 2012 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.

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