Delhi implemented the Bus Rapid Transit System to reduce air pollution and improve public transportation.

The Clean Air Act was enacted in the United States in 1970 to address air pollution and improve air quality.

Beijing implemented the Odd-Even License Plate Policy in 2012 to reduce air pollution by restricting the use of vehicles based on their license plate numbers.

The Great Smog of London occurred in 1952 and lasted for several days, causing severe air pollution and health problems.

Delhi implemented the Red Light On, Gaadi Off campaign to reduce air pollution by encouraging drivers to turn off their engines while waiting at red lights.

The Kyoto Protocol was adopted in 1997 and aimed to reduce greenhouse gas emissions to combat climate change.

Delhi implemented the Green Belt project to reduce air pollution by planting trees and creating green spaces around the city.

The Montreal Protocol was adopted in 1987 and aimed to reduce the production and consumption of ozone-depleting substances to protect the ozone layer.

Beijing implemented the Air Pollution Prevention and Control Action Plan in 2013 to reduce air pollution and improve air quality.

The Paris Agreement was adopted in 2015 and aimed to limit global temperature rise and reduce greenhouse gas emissions.

Delhi implemented the Odd-Even License Plate Policy in 2016 to reduce air pollution by restricting the use of vehicles based on their license plate numbers.

The National Clean Air Program was launched in the United States in 2019 to address air pollution and improve air quality.

Beijing implemented the Traffic Restriction Policy in 2008 to reduce air pollution by restricting the number of vehicles on the roads.

The Clean Air Act Amendments were enacted in the United States in 1990 to address air pollution and improve air quality.

Delhi implemented the Vehicle Scrapping Policy in 2021 to reduce air pollution by encouraging the scrapping of old and polluting vehicles.