EPA says Phoenix air meets ozone standards if you don't count pollution blowing in from outside the US

US environmental regulators determined that the Phoenix-Mesa area has reached acceptable air quality for ozone, but only by excluding emissions that cross the border from Mexico and other sources outside US jurisdiction. This lets the region officially meet federal air quality standards without actually reducing the pollution people breathe — it just reclassified where the pollution comes from.

For decades, the EPA has measured whether cities meet air quality standards by looking at what's actually in the air. This decision inverts that logic: it lets a region claim compliance by subtracting out pollution it can't control, rather than controlling the pollution it can. The structural shift is real but troubling — it sets a precedent where regulators can declare victory by narrowing the definition of the problem instead of solving it. Any other region with cross-border pollution now has a playbook: argue the dirty air isn't your responsibility, and you can pass inspection.