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92% of people globally live in places with dangerous levels of air pollution.

Here are some of the stories

Every year, millions of people die as a result of air pollution-related illnesses. According to the World Health Organization, 11.6 percent of all deaths worldwide are associated with air pollution, making it almost as deadly as tobacco.

Watery eyes, wheezing and difficulty breathing are acute and common reactions. But air pollution has other, less perceptible but insidious effects -- and it can harm you even before you take your first breath. Exposure to high levels of air pollution during pregnancy has been linked to miscarriages and premature births, as well as autism spectrum disorder and asthma in children

In a comprehensive study of the effects of air pollution in the United States, scientists at Harvard University found air pollution is especially dangerous for men, the poor and African-Americans, who are about three times as likely to die from exposure to the tiny pollutants.

HuffPost takes a look at what the WHO has declared a public health emergency. The stories from around the world include a dispatch from a low-income housing project in Orlando, Florida, where residents’ lives are marked by noxious fumes from a highway interchange that wraps around their home.

In Delhi, an acrid, yellow smog recently grounded international flights, closed schools and sparked a political crisis. HuffPost interviews homeless people who can never escape the pollution and are the most at risk.

In Brazil, reporters traveled to Santa Gertrude, where residents rely for their livelihood on the local ceramics industry that also fills the air with particles that are making people sick.

In Mexico City, reporters examined how lawmakers helped clear the air in what was once the world’s most polluted city. And HuffPost Germany looked at Berlin’s plans to become more bike friendly.

Finally, in a series of op-eds, mayors from New York, Houston, London, Paris, Rome, Madrid, Johannesburg, Cape Town and Montreal discuss how they are tackling the problem.