Toxic air is a year-round blight in nearly 60% of Indian districts: study, Pg12

Key Highlights:

• A study reveals that 60% (447 of 749) of India's districts exceed the National Ambient Air Quality Standard (NAAQS) for PM2.5 annually.
• No district in India meets the World Health Organization (WHO) guideline of 5 micrograms per cubic meter for PM2.5.
• Delhi and Assam have the highest number of polluted districts, with 11 each among the top 50 most polluted.
• Air quality improves during the monsoon season (June-September), with 90% of districts reporting safe PM2.5 levels.

Detailed Insights:

• The study challenges the common perception that air pollution in India is limited to the winter months.
• Northern and eastern states dominate India's PM2.5 pollution hotspots, while southern and coastal regions are relatively cleaner.
• During winter (December-February), 82% of districts breach national standards due to increased emissions and stagnant weather conditions.
• States like Andhra Pradesh, Telangana, Kerala, Sikkim, Goa, Karnataka, and Tamil Nadu have most districts within NAAQS limits.

Key Concepts Involved:

• PM2.5: Fine particulate matter with a diameter of 2.5 micrometers or less, a major air pollutant.
• NAAQS: National Ambient Air Quality Standards, the acceptable ambient air quality levels set by the Indian government.
• WHO Guidelines: Air quality recommendations issued by the World Health Organization to protect public health.