July 16, 2026Updated July 17, 2026, 6:12 p.m. ETAir quality across the United States is deteriorating due to wildfire smoke drifting south from Canada, prompting health warnings affecting millions from the Midwest to the Northeast. Forecasts suggest worsening conditions on Thursday, July 16, as smoke from over 850 active wildfires in Canada spreads into New York, New Jersey, and Pennsylvania.

Read More

Officials are alerting residents that fine particles in wildfire smoke can irritate the lungs and exacerbate heart and respiratory conditions. Vulnerable populations include children, older adults, individuals with preexisting health issues, and pets.

The Air Quality Index (AQI) is a valuable tool for assessing outdoor air quality, measuring levels from 0 to 500. Residents can check their local AQI by visiting the AirNow website and entering their zip code, city, or state. Here’s how to interpret AQI values:

- 0 to 50 (Green): Good air quality with minimal risk.

- 51 to 100 (Yellow): Acceptable air quality with some risk for sensitive individuals.

- 101 to 150 (Orange): Sensitive groups may experience health effects.

- 151 to 200 (Red): General public may begin to experience health effects; serious risks for sensitive groups.

- 201 to 300 (Purple): Increased risk of health effects for everyone.

- 301 and higher (Maroon): Emergency health conditions likely to affect all.

To stay safe during wildfire smoke events, the EPA recommends the following:

- Keep windows and doors closed.

- Avoid strenuous outdoor activities.

- Refrain from indoor activities that generate fine particles, such as smoking, and using gas or wood-burning stoves.

- Consider using N95 respirator masks, as cloth or paper masks do not adequately protect against smoke.

- For window air conditioning units, close the air damper if possible, and ensure a tight seal.

- Invest in a portable air cleaner or high-efficiency HVAC filter.

- Once air quality improves, open windows and use exhaust fans to ventilate your home.

Children are especially susceptible to wildfire smoke, which can hinder the development of their lungs. The EPA advises that children should remain indoors when air quality is poor and should not rely on masks for protection. Symptoms indicating potential issues from smoke exposure include chest pain, breathing difficulties, wheezing, coughing, dizziness, and irritation in the nose, throat, or eyes. Immediate medical attention is recommended if a child exhibits these symptoms.

Seniors are also at heightened risk due to age-related declines in lung and immune health. Those with chronic conditions like asthma or heart disease should minimize exposure to wildfire smoke, as the fine particles can cause severe complications, leading to hospitalization in some cases.

Pets, too, can suffer from smoke exposure. The American Veterinary Medical Association (AVMA) advises keeping pets indoors to minimize exposure and limiting outdoor breaks. Birds are particularly sensitive and should be kept indoors until conditions improve. Pet owners should watch for symptoms of smoke irritation in pets, such as coughing, watery eyes, nasal discharge, rapid breathing, fatigue, or reduced appetite, and seek veterinary care if these symptoms occur.

Greta Cross is a national trending reporter at USA TODAY. Story idea? Email her at [email protected].