Federal regulators ruled Monday that pollution from Mexico , not local sources, is why Phoenix fails air quality standards.
The U.S. Environmental Protection Agency decided not to reclassify the Phoenix-Metro area because of international emissions.
The EPA granted the Phoenix area an exemption from stricter air quality regulations, citing international emissions from Asia and Mexico that are outside local control.
A new report shows air pollution threatens the majority of the world’s population, while information gaps increase the risks.
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