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In terms of PM 2.5, the ambient concentration average range variation in which face masks were tested was from 5 to 25 g·m 3, and the mask with the highest effectiveness in terms of PM 2.5 was the MASK 7 with a value of 89%, while the lowest value was found for MASK 3 equal to 35% (merging the data for the three types of breathing). In
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The report focuses on PM2.5 as a representative measure of air pollution. Highlights of the report. India accounts for two thirds of the worlds most polluted cities 21 of the most polluted 30 cities; 14 of the highest 20; and 6 of the highest 10 in the report.
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