Is PM2.5 Worse on the Subway?

Yes! According to our tests, the particle counts varied a lot but, on average, platform air in the subway was worse than outdoor air. In the subway carriage, the air quality was worse than outside too.

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Smart Air is a social enterprise that creates simple, no-nonsense air purifier and provides free education to protect people’s health from the effects of air pollution. We are proud to be the only certified B-Corp dedicated to fighting air pollution.