Riverside County ranks poorly for air quality

Air pollution is the story here — not one bad day, but a pattern that keeps showing up year after year in the Inland Empire. The new trigger is the American Lung Association’s 2026 “State of the Air” report, released in late April, which again put Riverside County near the bottom of the national rankings for unhealthy air. That matters because these grades are tied to the stuff people actually breathe — ozone, which is smog, and fine particle pollution, which is the tiny soot that gets deep into the lungs. Basically, Riverside didn’t just get a bad score. It got another reminder that this is a structural problem, not a blip. (lung.org) ### What actually ranked so badly? Riverside County ranked second-worst in the country for ozone pollution in the 2026 report. It also got failing marks for particle pollution measures tracked by the Lung Association. On the California county page, Riverside shows an F for high ozone days, with a weighted average of 126.7 unhealthy days, plus failing grades tied to particle pollu(lung.org)air quality. (lung.org) ### What do those grades even mean? The ozone grade is built from the number of unhealthy air days, but not all bad days count the same. Orange days count less than red, purple, or maroon days, so the weighted average reflects both frequency and severity. For year-round particle pollution, the report uses the annual PM2.5 standard — counties at 9.1 micrograms per cubic meter or higher get a fail. So th(lung.org)alth-based thresholds. (lung.org) ### Why is Riverside always in this conversation? Geography is a big part of it. Southern California’s basin-and-mountain layout traps pollution, and the Inland Empire gets hit by pollution that forms locally and pollution that drifts east from the Los Angeles area. Heat makes ozone worse. Wildfire smoke can worsen particle pollution. Add freight traffic, warehouses, diesel engines, and fast regional g(lung.org)catch is that air can improve over the long term and still remain bad enough to fail health standards. (lung.org) ### Is this about 2026 air right now? Not exactly. The 2026 report is based on monitored data from 2022, 2023, and 2024. That matters because the report is best read as a three-year checkup, not a live AQI alert. If you want to know whether today’s air is unhealthy, that is a different tool entirely. But for judging whether a county has a chronic pollution problem, this kind of multi-year dataset is the more useful one. (lung.org) ### Who gets hurt most? Everyone breathes the same air, but the risk is not evenly shared. Children, older adults, pregnant people, and people with asthma, COPD, heart disease, or diabetes are more vulnerable. Ozone irritates the lungs and can trigger asthma attacks. Fine particles are worse in a different way — they can get deep into the lungs and are linked to respiratory and cardiovascular harm, including premature death. That(lung.org)environmental one. (lung.org) ### Is Riverside the only place struggling? No — but California is heavily overrepresented. The Lung Association says 44% of Americans, or 152.3 million people, live in places with failing grades for ozone or particle pollution. In California, the share is much higher — 82% in recent summaries of the report. Southern California counties show up over and over on the worst-of lists, which is why Riverside’s result feels familiar rather than shocking. (lung.org) ### So what is the real takeaway? The real story is persistence. Riverside County’s bad ranking is not a sudden collapse. It is evidence that the Inland Empire still has one of the country’s hardest air-quality problems to solve — even after years of regulation and some long-term progress. If that changes, it will take cleaner freight movement, cleaner vehicles, tougher emissions control, and fewer days when heat and smoke push the region back into dangerous air. (lung.org)