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.

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.

A combination of high heat, poor air quality, and the threat of severe thunderstorms is bearing down on New York City this weekend, prompting

Unhealthy Air Quality Index level. Red: Indexes in the 151 to 200 range are considered "unhealthy." At this level, any member of the general public becomes susceptible to health effects.

The DEC has issued an air quality health advisory for most of upstate New York due to elevated levels of fine particulate matter in the air.

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 Tuesday morning, the Air Quality Index in Milwaukee was between 115 to 120, which falls in the "unhealthy for sensitive groups" category.

TEMPO.CO, Jakarta - Jakarta's air quality on Wednesday, July 23, 2025, ranked second-worst in the world, according to the data from air monitoring site IQAir. The Air Quality Index ( AQI) in the capital recorded a level of 183, indicating unhealthy air conditions.