Loading...
UPSC 2022: 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?
(a)1, 3 and 4
(b)1 and 4 only
(c)2, 3 and 4
(d)1 and 2 only
Attempt This Question
Not attemptedCorrect Answer: (b) 1 and 4 only
WHO 2021 guidelines set PM2.5 limits at 15 µg/m³ (24-h) and 5 µg/m³ (annual), so statement 1 is correct. Peak ground-level ozone forms in sunny, hot conditions—not ‘inclement’ weather—so 2 is wrong. PM10 particles generally lodge in upper airways; only finer PM2.5 can cross into the bloodstream, so 3 is wrong. Excess ozone aggravates asthma, so 4 is correct. Thus only 1 and 4 are correct (option b). ([iasuniverse.com](https://www.iasuniverse.com/answers-with-explanation-upsc-prelims-gs1-paper-2022/5/?utm_source=openai))
Related Current Affairs
Related UPSC Questions
More from Pollution & Waste Management
2021moderate
‘R2 Code of Practices’ constitutes a tool available for promoting the adoption of
2021moderate
Why is there a concern about copper smelting plants? 1. They may release lethal quantities of carbon monoxide into environment. 2. The copper slag can
2021moderate
Magnetite particles, suspected to cause neurodegenerative problems, are generated as environmental pollutants from which of the following? 1. Brakes o
Related Environment & Ecology Topics
2022Sustainable Agriculture & Forestry
"System of Rice Intensification" of cultivation, in which alternate wetting and drying of rice fields is practised, results in: 1. Reduced seed requir
2022International Environmental Treaties & Summits
4. Articles made of it can be easily disposed of by incineration without causing greenhouse gas emissions. Which of the statements given above are cor
Frequently Asked Questions
What is the correct answer to this UPSC 2022 Environment & Ecology question?▼
The correct answer is option (b): 1 and 4 only. Watch the detailed video explanation in our Sherlocking Prelims course on UnlockIAS.
Which year was this Pollution & Waste Management question asked in UPSC Prelims?▼
This question was asked in UPSC CSE Prelims 2022, GS Paper 1, as Question 44. It falls under Environment & Ecology > Pollution & Waste Management.
What is the difficulty level of this UPSC question?▼
This question is rated "moderate". It requires sound conceptual understanding of the topic.
How many UPSC Prelims questions have been asked from Pollution & Waste Management?▼
UPSC has asked 38 questions from Pollution & Waste Management (under Environment & Ecology) across multiple years. Visit the topic page to see the full list and year-wise trends.