
Chicagoans face a dual threat of deadly heat and unhealthy air Friday, expected to be the hottest day so far this year.
Forecasters predict a heat index — a measure of temperature and humidity — that may reach 110 degrees.

Chicagoans face a dual threat of deadly heat and unhealthy air Friday, expected to be the hottest day so far this year.
Forecasters predict a heat index — a measure of temperature and humidity — that may reach 110 degrees.