Riverside County's Ozone Problem Spotlighted

Ozone is the big air problem in Riverside County right now — and the new numbers are ugly. During Air Quality Awareness Week, the American Lung Association’s 2026 “State of the Air” report put Riverside County near the very top of the national ozone rankings again, while local TV coverage turned that into a practical warning for residents heading into warmer, sunnier months. The basic issue is simple: ozone pollution spikes inland, it hits lungs hard, and Riverside sits in exactly the kind of geography that makes the problem stick. ### What’s the actual news here? The news is not that Riverside suddenly discovered smog. The news is that the latest annual report, released on April 21, 2026, shows Riverside County still ranking among the worst places in the country for ozone pollution, and the county is being singled out again as Air Quality Awareness Week focuses attention on local health risks. KESQ summarized the report as Riverside ranking second worst in the nation for ground-level ozone. ### Why is ozone the headline pollutant? Ozone is the gas people usually mean when they say smog. It is not emitted directly like smoke from a tailpipe. It forms when other pollutants react in sunlight, and South Coast AQMD says those precursor gases mostly come from mobile sources like cars, trucks, trains, ships, and aircraft. Inland valleys get hit especially hard because pollution drifts east and then cooks in heat and sun. ### How bad were Riverside’s numbers? The most eye-catching figure is 108 unhealthy ozone days in the Lung Association’s latest county-level snapshot, including 10 days classified as very unhealthy. The Lung Association’s county page also uses a weighted average system for unhealthy ozone days, and other summaries of the same 2026 report place Riverside second only to San Bernardino among U.S. counties for ozone burden. Basically, this is not a marginal problem. ### Is all of Riverside County equally bad? Not exactly — and this is where people get confused. South Coast AQMD has pushed back on reading the county as one uniform air shed, saying the American Lung Association report is a county snapshot and that pollutant levels differ a lot between the Greater Los Angeles-influenced basin and the Coachella Valley. NBC Palm Springs ### So why does Coachella Valley keep coming up? Because Coachella Valley’s headache is often PM10 dust, not just ozone. South Coast AQMD says the valley has long dealt with windblown desert dust, and the agency has expanded monitoring with cameras and field work since 2023. A January-February 2026 AQMD update says UC Riverside and UC San Diego/Scripps are helping identify the biggest dust sources so mitigation can target the worst hotspots first. ### What are officials doing besides measuring? Some of it is research, but some of it is pretty concrete. AQMD approved a three-part dust-reduction plan with an initial $750,000 allocation and potential support of up to $3.1 million, and Riverside County is also moving ahead with a $4.57 million dirt-road paving effort in the eastern Coachella Valley to cut dust emissions in mobile home park communities. ### Who should worry most? Children, older adults, and people with heart or lung disease are more sensitive to both ozone and particle pollution. Health advice in the recent local coverage was pretty straightforward — check air alerts before going out, keep medications handy if you have asthma or allergies, and consider a protective mask on especially dusty days. ### What’s the bottom line? Riverside County’s air story is really two stories at once. Countywide, ozone is still severe enough to keep Riverside near the top of the national rankings. In the Coachella Valley, the extra layer is dust — and officials are finally pairing warnings with more targeted monitoring and cleanup work.