In light of the severe air pollution in New Delhi, India, journalists have compiled information on the air pollution problems and solutions of three major world cities. The first, London, saw incredible air pollution in the 19th and 20th centuries, mostly resulting from the burning of coal in homes and factories. Their solution was passing the Clean Air Act which restricted the use of burning fuels with smoke and offered subsidies to switch to cleaner fuel sources. Beijing, China saw air pollution that followed rapid industrialization and car ownership in the 1980s. As of 2014, the area was deemed nearly uninhabitable by humans beings. While China still struggles with pollutants such as PM 2.5, they were able to cut their fine particle levels in some areas by 35%, primarily because of the implantation of very low emission standards, creation of an advanced air quality monitoring system, and building more public transportation. Finally, Mexico City, Mexico was noted as the most polluted city in the world in 1992 from so much automobile use. Mexico drove pollution down by being one of the first to implement restrictions on driving during the week, however, a increasing trend shows that people are choosing to ignore the law, leading to increased pollution.
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