DEP Issues Pollution Warning For Allegheny Co. (KDKA Pittsburgh) The Department of Environmental Protection has warned of dangerous levels of air pollution in Allegheny and nearby counties over the weekend. [News Source]

Caution: hot, bad air coming. It's summertime in the Northern San Joaquin Valley and the breathing is anything but easy. [News Source]

Ozone, heat a sizzling combo. Unless the winds blow and the skies unexpectedly pour rain, folks in Salt Lake, Davis, Utah, Tooele and Weber counties can expect a series of "red" air quality days, according to the man who makes the color call. [News Source]

Ozone levels soar past limit. In Denver, Colorado, soaring ozone levels late this week worried local air-quality trackers who fear pollution counts could keep rising in the metro area as temperatures reach 100 degrees over the next several days. [News Source]

Air pollution advisory issued for the weekend. The Minnesota Pollution Control Agency has issued an Air Pollution Health Advisory for the Twin Cities metro area for Saturday and Sunday. [News Source]

Air pollution alerts issued for tomorrow, Monday. The Louisville area is in for its first air pollution alerts of the summer, thanks to spiking temperatures and a high-pressure system that will keep rain and wind away, officials said. [News Source]

High heat cooks up harmful pollution. Central Ohio's bad-air season is off to a fast start. [News Source]

Heat, ozone levels to soar. Delaware Air Quality program manager Ray Malenfant issued a right-to-the-point heat wave forecast for the next few days late Friday afternoon. [News Source]

Hot weather warnings. The National Weather Service has issued a hazardous weather condition notice for this weekend and early next week. [News Source]

Air pollution changes cloud cover. Tiny particles of pollution suspended in the air can stop clouds from forming, a NASA study says. [News Source]

EPA orders dry-cleaning chemical phase-out. Dry cleaners operating in residential buildings will have to begin phasing out their use of a suspected cancer-causing chemical. [News Source]