Over the next two weeks, extreme levels of humidity are forecast to hit around 40 states, with the first wave of very muggy weather building in central and eastern states through Thursday.

Population growth is far from even across the U.S. Some cities are experiencing significant increases, directly driven by ...

Some residents of several major cities in the Midwest could face an increased risk of heart attack and stroke as smoke from Canadian wildfires continues to descend into the United States this week ...

While allergies affect people everywhere, some US cities are especially tough. The Asthma and Allergy Foundation has ranked the top 10 worst cities in the US for those with allergies. The cities were ...

Last summer, a heat dome “broiled” the Northeast and Midwest. This summer, it’s coming for big cities in the central U.S. and ...

Temps are soaring in cities across the Atlantic coast, where some cities are reaching 100 degrees with heat indexes ...

Heat dome will cause dangerously high temperatures in many places across the country this weekend, especially the Midwest and ...

Many places around the country will experience their first significant heat of the year in the next few days. Here’s why it’s ...

The Minnesota Pollution Control Agency issued an alert for almost the entire state into Wednesday, but the Twin Cities area got the worst of it in the Midwest on Tuesday ... Protection Agency’s AirNow ...

Smoke from Canadian wildfires began to worsen air quality in the eastern U.S. on Wednesday as several Midwestern states continued to battle conditions seemed unhealthy by the federal government ...

Smoke from Canadian wildfires worsened air quality in the eastern U.S. on Wednesday as several Midwestern states battled conditions deemed unhealthy by the federal government. In the U.S., smoke ...