The places where you are breathing the highest amount of other people's 'breath backwash' - Newshub

"Think of it as spit particles, tiny spit particles are what you are breathing in."

Cram lots of people into a small space and CO2 will rise. Buses, trains and ferries rated poorly in RNZ's tests. The number of passengers made a difference; the lowest reading of 884ppm was taken in … [+4161 chars]

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