"Canada Wildfires Cause Air Quality Concerns Across North America"

TL;DR Summary
As smoke from Canadian wildfires reaches the east coast of the US, New York City's air quality has become the second worst on Earth. To protect against the health hazards of the hazy air, residents can build their own air filter using a box fan and four AC air filters rated MERV 13-16 or MPR 1200-2800. By taping the filters together in a square and placing the fan on top, the filter can effectively strain 2.5um smoke particles from the ambient air.
- How to build a box fan air filter to escape the Canada wildfire smoke Engadget
- Experts on NYC's future air quality FOX 5 New York
- NYC residents urged to stay indoors as air quality worsens by Canadian wildfire Al Jazeera English
- Wildfire smoke creating smoky conditions across New York CBS New York
- Canada Wildfires Worsen Air Quality for Millions in North America: Live Updates The New York Times
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