Question 1 of 10UPSC CSE Prelims · 2022 · Environmental Pollution
In the context of WHO Air Quality Guidelines, consider the following statements:
1The 24-hour mean of PM2.5 should not exceed 15 micrograms per cubic metre and its annual mean should not exceed 5 micrograms per cubic metre.
2The highest ozone-pollution levels occur during inclement weather.
3PM10 can penetrate the lung barrier and enter the bloodstream.
4Excessive ozone in the air can trigger asthma.
Which statements are correct?
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