From July 12 to 15 in 1995, the heat index soared above 120 degrees, killing 739 people in the deadliest natural disaster in ...

PM2.5 pollution is spiking in many counties in Utah and is accompanied by the typical summer pollutant of ozone. It makes for a nasty mix of pollution.

Air quality in the Chicago area has remained poor for three days in a row, the NBC 5 Storm Team reported Wednesday morning.

Tool shows history of heat-related deaths, demographics, land use and air conditioning access across communities.

Today is partly sunny and hot! Highs will be in the upper 80s and low 90s with the heat index pushing to around 100!