Sentences with phrase «remove dangerous air pollution»

Not exact matches

In less than two minutes, the HEPA filtration system had scrubbed the air in the Passivhaus, bringing pollution levels from an extremely dangerous 1,000 µg / m3 to levels so low as to be undetectable (below the noise floor) by the instruments, allowing the test scientists to remove their gas masks and breathe fresh air while sitting inside a biome full of pollution.