Why in the News?
A recent study conducted in Kolkata shows that the toxicity value of PM2.5 experiences a sudden jump when the pollution level reaches around 70 µg/m³.
About PM2.5
- PM2.5 refers to fine particulate matter with a diameter of 2.5 micrometers or smaller.
- It is a major air pollutant linked to respiratory and cardiovascular diseases. Long-term exposure increases the risk of lung cancer, heart disease, asthma, and other health issues.
- Major sources include vehicle exhaust, industrial emissions, construction dust, biomass burning, and solid waste burning, contributing to both outdoor and indoor pollution.
- WHO recommends that the annual average PM2.5 concentration should NOT exceed 5 µg/m³, and the 24-hour average should not exceed 15 µg/m³ for more than 3-4 days per year.
PM2.5 on Govt. Focus: National Clean Air Program (NCAP)
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About the Notified Toxicity Standard for PM2.5
- A new toxicity standard for PM2.5 in Kolkata sets the critical threshold at 70 µg/m³.
- Below this level, toxicity remains stable, but it sharply increases once the concentration exceeds 70 µg/m³.
- It emphasizes reducing pollution sources, particularly biomass and solid waste burning, which contribute significantly to high PM2.5 levels and increased toxicity in Kolkata.
- Policy Recommendation: To reduce health risks, air quality control measures should aim to keep PM2.5 levels below 70 µg/m³.
| [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 |
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