The National Ambient Air Quality Standards (NAAQS) in India set the 24-hour mean PM2.5 standard at:

• A 15 μg/m³
• B 60 μg/m³ ✓
• C 100 μg/m³
• D 25 μg/m³

Explanation

India's NAAQS (revised 2009) sets PM2.5 at 60 μg/m³ for the 24-hour mean, considerably higher than WHO's 2005 guideline of 25 μg/m³ and the even stricter 2021 updated WHO guideline of 15 μg/m³. The annual mean NAAQS standard for PM2.5 in India is 40 μg/m³. India's standards reflect developmental realities and feasibility constraints.

Reference: Park's Textbook of Preventive and Social Medicine, 27th ed.

High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP

Written and medically reviewed by the StethoPrep medical team.