Particulate matter has many sources, such as transportation, power plants, agriculture, the burning of waste and industry — as well as from natural sources like desert dust.
The developing world is particularly hard hit: India had high levels of PM10, while China showed high levels of PM2.5, the database showed.
The findings highlight the sheer scale of the changes needed to combat air pollution, said Anumita Roychowdhury, an air pollution expert at Center for Science and Environment, a research and advocacy organization in New Delhi. The Council on Energy, Environment and Water, a New Delhi-based think tank, found in a study that more than 60 percent of India’s PM2.5 loads are from households and industries.
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