An air quality alert remains in effect for the entire Chicago area, with another "Air Pollution Action Day" alert declared as wildfire smoke from Canadian wildfires continues to impact parts of the Midwest.

Another air quality alert has been issued for the NYC area today, and it has expanded to include Long Island and New Jersey.

Iowans are starting the week with more bad air quality ratings as haze lingers, but the National Weather Service says relief is in sight.

Part of the mid- and lower Hudson Valley is under an advisory for ground-level ozone pollution, which is expected to worsen air quality on Wednesday.

Parts of the Twin Cities registered upward of 240 on the air quality index — levels considered “very unhealthy” for everyone — even as rain poured steadily across the metro region. Here’s what you need to know about this week’s poor air conditions,