As Australian Open Begins, Pollution From Fires Is in Play – The New York Times

“If it does get bad, I can’t think of going out there and everybody going out there and playing three out of 5 sets,” said Denis Shapovalov, a Canadian seeded 13th in the competition. The Australian Open chose that play would be instantly suspended outdoors if the levels of tiny particle pollution, called PM2.5, went beyond a threshold of 200 micrograms per cubic meter., the upper limit of the harmful kind of pollution for air quality to be thought about “great” is 12 micrograms per cubic meter over 24 hours.

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