Plastic in Everyday Items
Question
In the context of WHO Air Quality Guidelines, consider the following statements: Which of the statements given above are correct?
- 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.
Options
1, 3 and 4
1 and 4 only
2, 3 and 4
1 and 2 only
Explanation
Statements 1 and 4 are correct. Statements 2 and 3 are incorrect.
Ozone pollution actually peaks during sunny, warm weather due to photochemical reactions, not during inclement (stormy/cloudy) weather. Furthermore, it is the ultra-fine PM2.5 particles that cross the lung barrier into the bloodstream; PM10 is generally too large and lodges in the upper respiratory tract.
Answer: (b).
Question details
Year
2025
Paper
GS Paper 1
Question
Q44
Subject
Environment
Sub-topic
Pollution & Waste
Type
How-many counting
Difficulty
Easy
Nature
Static
Source hint
WHO Global Air Quality Guidelines Revision
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