World Air Quality

World Air Quality Report prepared by IQAir, Delhi ranked 4^th out of 50 of the world’s most polluted cities in terms of PM2.5 levels in 2022.

Out of 131 countries, India ranked 8^th with a population-weighted average PM2.5 level of 53.3 μg/m3 in 2022.

About:
- IQAir, a Swiss air quality technology company, prepares the annual world air quality reports based on data from monitoring stations operated by governments and other institutions and organisations across the world.
  - The 2022 report is based on PM2.5 data from 7,323 cities and 131 countries.
Findings:
- Chad, Iraq, Pakistan, Bahrain, and Bangladesh are the 5 most polluted countries in 2022.
- Delhi had an average PM2.5 level of 92.6 μg/m3 in 2022, a little below the average of 96.4 μg/m3 in 2021.
  - The report makes a distinction between New Delhi and Delhi, with New Delhi having an annual average PM2.5 level of 89.1 μg/m3.
  - The WHO guideline for annual PM2.5 levels is 5 μg/m3.
- Lahore was the most polluted city in the world, followed by Hotan in China, and Bhiwadi in Rajasthan.
- New Delhi is the second most polluted capital city in the world, with N’Djamena in Chad topping the list.
- A total of 39 Indian cities (including ‘Delhi’ and ‘New Delhi’) are on the list of 50 of the world’s most polluted cities based on annual average PM2.5 levels in 2022.

PM 2.5 is an atmospheric particulate matter of a diameter of fewer than 2.5 micrometres, which is around 3% of the diameter of a human hair.
PM 2.5 particles are small enough to penetrate deep into the lungs and even enter the bloodstream, and long-term exposure to PM 2.5 can lead to lung cancer, heart disease, stroke, and other chronic health conditions.

Link Zero Emissions with Human Rights: Air pollution needs to be recognized more as a human rights issue rather than merely as an environmental challenge, and should be linked with the mission of net zero emission (by 2070).
- The UN General Assembly (UNGA) has also passed a resolution recognizing the right to a clean, healthy, and sustainable environment as a human right.
Green-Transition Finance: There is a need to create a financial architecture that can mobilise private finance for clean-air solutions in India. Green sectors such as clean energy and e-mobility offer tangible solutions to improve air quality.
Bio Enzyme-PUSA: A bio-enzyme called PUSA has been developed by the Indian Agriculture Research Institute as a solution to stubble burning.
- As soon as it is sprayed, this enzyme starts decomposing the stubble in 20-25 days, turning it into manure, which further improves the soil.
Ready-Made Concrete for Construction: Construction dust is a major contributor to pollutants in the air in expanding cities.
- To deal with this situation, Niti Aayog has suggested the use of ready-made concrete that can minimise the environmental impacts of building activities.