Canadian wildfire smoke continues to shroud the US midwest, mid-Atlantic, and north-east, causing hazardous air quality for tens of millions of Americans. The pungent smoke from wildfires in western Ontario has blanketed cities like Chicago and Detroit, with air quality index readings reaching a dangerous 361, according to AirNow.
How Canadian Wildfire Smoke Impacts Air Quality
The smoke has drifted into Baltimore, Washington DC, and New York City, creating very unhealthy conditions. In New York, air quality stood at an unhealthy 184 early Friday before improving to 124, still considered unhealthy for sensitive groups. Philadelphia and Cleveland recorded readings around 260, classified as very unhealthy.
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Regions Most Affected by Wildfire Smoke
Parts of Michigan, Minnesota, and Wisconsin also recorded hazardous readings. The global air quality index showed pollution in five major North American cities surpassing levels in Kinshasa and Nairobi. Nasa’s Fire Information for Resource Management System shows Canadian wildfires reaching deep into the Northwest Territories.
| City | Air Quality Index (AQI) | Health Advisory |
|---|---|---|
| Chicago | 361 | Hazardous |
| Detroit | 361 | Hazardous |
| Baltimore | 281 | Very Unhealthy |
| Washington DC | 247 | Very Unhealthy |
| New York City | 184 | Unhealthy |
| Philadelphia | 260 | Very Unhealthy |
| Cleveland | 260 | Very Unhealthy |
Health Recommendations During Wildfire Smoke Events
In Michigan, the state’s department of environment, Great Lakes and energy recommended closing windows, minimizing door openings, and using HVAC systems rated Merv-13 or higher. “If you must be outdoors for short periods of time, an N95 or P100 respirator marked with NIOSH is recommended,” their alert stated.
- Stay indoors with windows and doors closed.
- Use air purifiers with HEPA filters to reduce indoor smoke particles.
- Wear N95 or P100 respirators if you must go outside.
- Limit physical activity to reduce inhalation of pollutants.
- Monitor local air quality readings on AirNow.gov.
Relief Expected for Some Regions
Some cities in the north-east and New England are expected to get relief from smoky skies on Friday as stronger winds from Quebec blow the smoke out. However, there has been a clear intensification in wildfire activity for Canada over the past few weeks, suggesting more smoke events may occur.
FAQ
What does an air quality index of 361 mean?
An AQI of 361 is considered hazardous, meaning everyone should avoid outdoor physical activity and stay indoors. Sensitive groups are at high risk of health effects.
How can I protect my home from wildfire smoke?
Close all windows and doors, use an air purifier with a HEPA filter, and set your HVAC system to recirculate with a Merv-13 or higher filter.
Are N95 masks effective against wildfire smoke?
Yes, N95 or P100 respirators marked with NIOSH are effective at filtering fine smoke particles when worn properly outdoors.
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