Innovative Strategy Combines Cleaner Air with Economic Growth in Maricopa County
In a landmark development for Maricopa County, a new strategy aims to tackle emissions while simultaneously fostering economic growth. The U.S. Environmental Protection Agency (EPA) has granted its final approval to Rule 205, an initiative crafted by Maricopa County to provide emission reduction credits to fleet owners who choose to upgrade or replace their high-emission vehicles.
“Rule 205 is a win-win for our residents, demonstrating that Maricopa County can prioritize both cleaner air and a strong economy,” said Maricopa County Board of Supervisors Chair Kate Brophy McGee, District 3. “By incentivizing rather than punishing job creators, this approach will deliver measurable improvements in air quality while creating new opportunities for businesses to invest and expand.”
Approved in May 2025, Rule 205 enables fleet operators to generate emission reduction credits (ERCs) by replacing or upgrading their higher-emitting on-road vehicles with cleaner alternatives. These credits can then be used to offset emissions from industrial sources that are new or expanding, thus helping businesses comply with the Clean Air Act under the nonattainment New Source Review program. With the EPA’s final nod, Maricopa County can immediately begin issuing these credits to businesses.
Vice Chair Debbie Lesko, District 4, expressed her appreciation: “I applaud EPA Administrator Lee Zeldin for working with Maricopa County to find Clean Air solutions that fit the unique needs of our region. It’s proof we can partner with the federal government to streamline regulations while still protecting the quality of the air we breathe.”
This approval follows closely on the heels of the EPA’s proposed endorsement of Rule 204, another Maricopa County initiative. Rule 204 aims to incentivize the owners of non-road vehicles, such as railroad locomotives and construction equipment, to transition to cleaner technologies.
Both rules are pioneering efforts, setting Maricopa County at the forefront of effective and innovative governance. Together, they offer a new approach for regulators and businesses to meet federal air quality standards while promoting economic development.
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