SALT LAKE CITY (AP) — Much of northern Utah remains under a health alert from lung-busting soot counts as high pressure aloft traps tailpipe and industrial emissions in mountain valleys.
No relief is in sight after nearly a week of air pollution warnings.
State regulators are banning wood burning, urging people to drive less and warning people with heart or respiratory problems to stay indoors.
The greater Salt Lake region logged 60 micrograms of fine soot per cubic meter on Monday, more than twice the federal standard.
The U.S. Environmental Protection Agency says northern Utah has among the nation's dirtiest air. Only central California had worst air on Monday.
The National Weather Service says conditions in Utah are worsening, and that a storm system arriving Thursday won't be strong enough to sweep valleys of the toxic fog.