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SALT LAKE CITY (AP) -- Daily reports on Utah's air quality are starting earlier.
An inversion last weekend led state officials to start issuing advisories before Nov. 1.
"If everyone does their part to heed the wood-burning warnings and use mass transit whenever possible, it will make a significant difference in our air quality," said Bob Dalley, manager of the state's Air Monitoring Center.
In an inversion, cold air and pollutants are trapped under warmer air. Air quality has been labeled green, or "moderate," since Sunday in Salt Lake and Davis counties.
A red day means wood burning is prohibited. Yellow is a voluntary no-burn.
Vehicles are a major contributor to winter pollution.
Information from: The Salt Lake Tribune
(Copyright 2007 by The Associated Press. All Rights Reserved.)