But global average estimates such as this assume that these particles are the same the world over. They are not: PM 2.5 is a cocktail of chemicals (hydrocarbons, salts and other compounds given off by vehicles, cooking stoves and industry) and other, natural components such as dust and microorganisms. The mix — and its toxicity — varies from place to place and over time, in ways that are not tracked, understood or managed.
Air pollution: A Global Problem needs Local Fixes
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