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The 'Cowtown monitor,' an air-quality monitor in the City of Maricopa, has routinely recorded the highest levels of large particulate matter pollution in the state, topping federally acceptable levels, according to the EPA.

EPA says Maricopa City meets air-quality standard; more work needed

Jul 15, 2013 ◇ Evan Bell/Cronkite News Service

The Environmental Protection Agency said Friday that air-quality in western Pinal County has improved enough to meet a federal standard for soot and other particles. Read more»

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The U.S.-Mexico border fence, running from upper left to lower right in this 2004 aerial photograph, divides Nogales, Ariz., on the left and Nogales, Sonora, on the right.

EPA opens window to Nogales air quality plan

Sep 27, 2012 ◇ Cale Ottens/Cronkite News Service

The Environmental Protection Agency and Arizona agree that the city of Nogales would be in compliance with clean-air standards, if it wasn't for 90 percent of their pollution drifting over from Mexico. Read more»

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