Some countries struggle more with pollution from heavy traffic or industry, while other regions have wildfires as their main concern.

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https://childrenshealthdefense.org/defender/global-population-air-pollution-study/

Nearly the entire global population is regularly exposed to unsafe levels of air pollution particles that can enter the bloodstream through the lungs and contribute to premature death, asthma, heart disease and other health problems, according to a study published this month.

childrenshealthdefense.org