GyanGramIn the context of WHO Air Quality Guidelines, consider the following statements: 1. The 24-hour mean of PM2.5…
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In the context of 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 ug/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?
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• Correct Answer: B
• WHO 2021 guidelines: PM2.5 24-hour mean 15 μg/m3, annual mean 5 μg/m3; excessive ozone triggers asthma.
• Ozone peaks in warm sunny weather, not inclement conditions; PM2.5 penetrates bloodstream, not PM10.
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