UPSC PRELIMS · GEOGRAPHY · AIR POLLUTION AND WHO GUIDELINES
In the context of WHO Air Quality Guidelines, consider the following statements: 1. The 24-hour mean of PM2.5 should not exceed 15 µg/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?
Take a breath. Choose one. Press A–D on your keyboard if you like.
EXPLANATION
The stated PM2.5 guideline values are correct for the WHO 2021 guideline; ozone is associated with respiratory effects such as asthma, while the statement about ozone peaking in inclement weather is incorrect.
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