Wildfire smoke alerts spread Midwest to Northeast—protect your lungs with AQI

Wildfire smoke from Canada and Minnesota is expected to engulf large swaths of the Midwest and Northeast this week, exposing millions to dangerous air pollution, AP reports. Minnesota issued an air quality alert from Tuesday through Friday, and western and central New York counties were under an advisory Wednesday until midnight. AP says the most intense smoke could reach as far south as Washington, D.C., by midday Thursday.

What to watch right now: AQI (driven by PM2.5)

For wildfire smoke, the key number is the Air Quality Index (AQI), which is designed to reflect levels of fine particles—especially PM2.5. When AQI is in the Unhealthy for Sensitive Groups range (101–150), the EPA’s guidance calls for tougher limits on outdoor activity for sensitive people. It becomes more restrictive at Hazardous levels (301+).

If you’re planning outdoor exercise, child drop-offs, or time-consuming errands, check the AQI first—and treat smoke conditions as a real health risk, not just a smell.

Who should take extra precautions

Smoke does not affect everyone the same way. The EPA flags higher risk for people with asthma, COPD, or heart disease, along with children, older adults, and pregnant people, plus outdoor workers.

If you develop symptoms such as cough or shortness of breath, or you have a lung or heart condition, the EPA guidance emphasizes moving to “cleaner air,” reducing activity, and—if symptoms worsen or are concerning for your condition—contacting a health care provider.

What to do at home

When air quality is compromised, the most practical household steps are to reduce smoke exposure and keep indoor air as clean as possible.

• Cut down outdoor exertion. Keep outdoor activity shorter and less intense when AQI is elevated.
• Close up before smoke worsens. The EPA recommends closing windows and window coverings (like shades, blinds, and awnings) during the day before it gets hot outside.
• Use filtration. Consider portable air cleaners (room air cleaners/air purifiers) and set up a “cleaner air” room for the people who are most at risk.
• Adjust ventilation choices. During high outdoor air pollution, the EPA says ventilation systems may need to be turned off or adjusted to avoid pulling smoky air indoors.

If you must go outside: respirator basics

If you have to be outside during smoky conditions—such as for work—EPA and FEMA’s U.S. Fire Administration recommend respiratory protection.

• Choose a NIOSH-approved respirator. The EPA notes that N95 (or P100) respirators must be approved, with “NIOSH” and either “N95” or “P100” printed on the facepiece by the manufacturer.
• Use the AQI to guide how long you stay outside. As AQI worsens, the EPA’s activity guidance becomes more restrictive—especially for sensitive groups.

How to monitor updates—and what comes next

Smoke can shift hour to hour. Before you plan outdoor time, check the AQI using AirNow and its Fire and Smoke Map.

AP’s report says the most intense smoke could reach Washington, D.C., by midday Thursday, so check the AQI again on Thursday before you head outside.

Sources

• Associated Press (AP): “Wildfires expose millions in the Midwest and Northeast US to dangerous smoke”
• U.S. EPA: Wildfire Smoke guide for public health officials (2026) (PDF)
• FEMA U.S. Fire Administration (USFA): “Minimizing the Effects of Wildfire Smoke”