According to the Central Pollution Control Board (CPCB), the permissible 24-hour limit for PM2.5 in India is _____ µg/m³.
- 40
- 60
- 100
- 120
Answer: 60
The CPCB sets the National Ambient Air Quality Standards (NAAQS) for PM2.5 at 60 µg/m³ for a 24-hour average.