Maricopa County has not met federal ambient air quality standards for PM10 (airborne particulate matter with a diameter of 10 micrometers or less). As a result, the U.S. Environmental Protection Agency has threatened to cut federal highway funding if the country doesn’t make the effort to meet these standards.
In response, the Maricopa County Air Quality Department (MCAQD) developed the Five Percent Plan, which aims to decrease PM10 emissions by at least five percent per year until the standard is achieved. As part of that plan, MCAQD recently adopted stricter rules regarding dust generating activities by businesses and individuals within Maricopa County.
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