In the context of In WHO Air Quality Guidelines, consider the following statements:1. The 24-hour mean of PM2.5 should not exceed 15 ug/m3 and annual mean of PM2.5 should not exceed 5 µg/m³.2. In a year, the highest levels of ozone pollution occur during the periods of inclement weather.3. PM10 can penetrate the lung barrier and enter the bloodstream.4. Excessive ozone in the air can trigger asthma.Which of the statements given above are correct? - Study24x7
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Dev kumar
01 Jan 1970 05:30 AM study24x7 study24x7

In the context of In WHO Air Quality Guidelines, consider the following statements:
1. The 24-hour mean of PM2.5 should not exceed 15 ug/m3 and annual mean of PM2.5 should not exceed 5 µg/m³.
2. In a year, the highest levels of ozone pollution occur during the periods of ...

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A

1, 3 and 4

B

1 and 4 only

C

2, 3 and 4

D

1 and 2 only

UPSC
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