SALT LAKE CITY (AP) - Northern Utah remains under a health alert from high soot counts.
Neighboring Salt Lake and Davis counties had the region’s heaviest concentration Monday of lung-busting particulate matter - 56 micrograms per cubic meter.
Cache County logged 45 micrograms. The federal standard is 35 micrograms.
No relief is in sight as a winter inversion traps tailpipe and other emissions in urban valleys.
Officials are banning wood-burning and urging people to drive less.
The U.S. Environmental Protection Agency says the Salt Lake region and parts of central California had the nation’s dirtiest air Wednesday.
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