Prelims Practice - Environment - Prelims Test Series Sample Questions
The World Health Organization (WHO) has recently updated global air pollution standards, a first since 2005. New WHO Global Air Quality Guidelines (AQGs) 2021, provide clear evidence of the damage air pollution inflicts on human health, at even lower concentrations than previously understood. WHO’s new guidelines recommend air quality levels for which of the following pollutants?
1. Particulate matter (PM2.5)
2. Ozone (O₃)
3. Carbon dioxide (CO₂)
4. Nitrogen dioxide (NO₂)
5. Sulfur dioxide (SO₂)
6. Carbon monoxide (CO)
Select the correct answer using the code given below:
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