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Stuart Johnson, Deseret News
The Salt Lake Valley is barey visible with the winter inversion blanketing the valley Tuesday, Jan. 7, 2013.

SALT LAKE CITY — The Salt Lake Valley was blanketed in smog again Tuesday as winter inversion season continued.

Temperatures in the valley are expected to be back up in the 30s over the next few days, but the air quality is forecast as unhealthy for sensitive groups, including people with lung disease, such as asthma; children and older adults; and people who are active outdoors, according to www.airquality.utah.gov.