Air Quality Index (AQI)

New York City's air quality is expected to remain unhealthy through the weekend, with an Air Quality Index (AQI) forecast of 151-200 on July 18. The New York City Office of Emergency Management issued an Air Quality Health Advisory, warning that the conditions are unhealthy for everyone, particularly sensitive groups.

Detroit has closed the Coleman A. Young Municipal Center and canceled public events due to hazardous air quality caused by smoke from Northwest wildfires. The city distributed N95 and KN95 masks to residents and urged people to stay indoors, with officials noting unprecedented air quality index (AQI) levels exceeding 700 in some areas.

Hazy skies in Middle Tennessee were caused by heat, humidity, and urban emissions rather than Canadian wildfires affecting other U.S. regions. Air quality is expected to remain in 'good' to 'moderate' levels, with minor impacts through the weekend.

A 4Warn Weather Alert and Air Quality Alert have been extended through Friday in Southeast Michigan due to hazardous wildfire smoke, with air quality reaching record levels. The smoke contains PM2.5 particles, posing health risks to everyone, and officials advise staying indoors and avoiding outdoor exertion.

New York City is under an Air Quality Advisory due to Canadian wildfire smoke, exacerbating existing health concerns from a heatwave and a Legionnaires’ disease outbreak. The city’s Air Quality Index reached 155, classified as 'unhealthy,' with officials advising vulnerable groups to limit outdoor exposure and use masks. Governor Kathy Hochul warned of statewide poor air quality from the smoke and heat, urging precautions.