Solution:

Delhi is the fourth most polluted city in the world, according to a list of 41 cities. The use of fossil fuels contributes to Delhi’s air pollution. Several steps have been taken to enhance Delhi’s air quality, including:

(i) CNG (Compressed Natural Gas) — CNG is a clean fuel that produces very little unburned matter. To lower pollution levels in Delhi, the Supreme Court of India has ordered the use of CNG-powered vehicles, which were introduced at the end of .

(ii) Old vehicles are no longer used

(iii)Catalytic converters are used

(iv) Unleaded gasoline is used

(v)Diesel and low-sulphur gasoline is used

(vi) Vehicle pollution standards are strictly enforced

(vii) Bharat Stage I, which is identical to Euro II, has been adopted in major Indian cities’ vehicles.

The introduction of CNG-powered vehicles has improved Delhi’s air quality, resulting in a significant reduction in CO₂ and SO₂levels. However, there is still a problem with suspended particulate matter (SPM) and respiratory suspended particulate matter (RSPM).