Thursday: A slight chance of showers and thunderstorms after 2 p.m. Sunny, with a high near 94. Heat index values as high as 103. Calm wind becoming southwest 5 to 7 mph in the morning. Chance of precipitation is 20%.

AirNow and PurpleAir use the Air Quality Index, or A.Q.I., a measure of air quality from 0 to 500 that is composed of six categories, from “good” to “hazardous.”

As of Wednesday, more than 400 wildfires were burning across Canada, leading to air quality alerts − indicators the air is unsafe to breathe for certain people − across much of the eastern U.S.

A heat advisory will be in effect for parts of the area this week as heat indices reach 100 degrees in parts of Delaware. See the weather forecast.

Scattered storms are back for Sunday afternoon, primarily between 1 and 7 p.m. Any activity eyeing the tri-state through the afternoon and evening could bring severe storms, damaging winds and flash flooding.

The National Weather Service has issued a heat advisory for Rhode Island and other parts of Southern New England.

Thursday, Detroit had the worst air quality in the world, according to AQI rankings and Friday was remained in the red or "unhealthy" category. There are nearly 500 active wildfires in Canada, and ...

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MIchigan's air quality will be unhealthy for some groups Friday. Check the air quality index map to see if it's good or bad near you.