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NASA Shares Worrying Images Of US East Coast Engulfed By Smoke From Canadian WildfiresThe air quality index measures PM2.5, less than 2.5 microns particles, to determine the intensity of air pollution in cities.
A string of hot and stormy days has left numerous fires burning across Victoria, Tasmania and South Australia this week.
The North Fork Fire burning in the Woodlawn community of McDowell County remains at 644 acres and is 90% contained.
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