Air Quality in Riverside, California — Live
Live readings from PurpleAir sensors across Riverside — with free alerts the moment the air turns.
AQI 53 from 4 PurpleAir sensors · Trending up · data from PurpleAir
As of , the air quality in Riverside, California is AQI 53 — Moderate and rising — with PM2.5 at 10.1 µg/m³, the median of 4 live PurpleAir sensors reading 1 to 53. Canairy's verdict: Mostly clear.
For scale, that PM2.5 reading is below the World Health Organization's 24-hour guideline of 15 µg/m³. The WHO figure is a daily average and this is a live reading, so read it as a sense of magnitude rather than a formal exceedance — a brief spike and a bad day are not the same thing. More on the WHO guidelines
Pollen today in Riverside: weeds pollen is the strongest of the three at a moderate level, from Google's pollen forecast. Canairy shows the tree, grass and weed forecast beside the air reading on every plan, including the free one.
Free to download · Live data from PurpleAir & public monitors
Live PurpleAir sensor map for Riverside and Moreno Valley, Corona, Redlands, San Bernardino. Every dot is a real sensor, color-coded by current air quality.
Sensor by sensor in Riverside
The sensors Canairy reads in Riverside are 52 AQI points apart right now, from Good to Moderate, which is the whole reason one city-wide number can mislead you: the median describes air you may not be standing in.
| From city center | AQI | Category |
|---|---|---|
| 2.0 mi ESE | 53 | Moderate |
| 2.7 mi WNW | 53 | Moderate |
| 3.7 mi ESE | 1 | Good |
| 4.8 mi SSE | 36 | Good |
Riverside sits at the receiving end of Southern California's air. Ocean breezes push the Los Angeles Basin's smog east through the mountain passes each afternoon, where the San Bernardino Mountains wall it in and summer heat cooks it into ozone, and the American Lung Association routinely ranks the Riverside-San Bernardino area at or near the top of the nation for smog. Add the Inland Empire's warehouse and diesel-truck traffic and the wildfire smoke that drifts down from the surrounding hills, and clean-air days here are worth paying attention to.
What Canairy does for Riverside
A clear verdict
Not just a number — a plain-English call for Riverside: open the windows, or keep them shut.
Smoke alerts
A push or text the moment the air crosses your threshold — and again when it clears.
A heads-up before it's bad
Trend alerts catch the air turning, so you can close up the house before the smoke settles in.
Every place you care about
Home, work, the kids' school — across Riverside or across the country, on one screen.
What the air in Riverside is doing next
| When | AQI | Expected air quality | Main pollutant |
|---|---|---|---|
| Today | 87 | Moderate | ozone |
Forecast from EPA AirNow for the Metro Riverside CO reporting area. Canairy watches the live sensors against it and tells you when the air actually crosses your threshold, rather than leaving you to check.
Riverside breathes what the whole LA Basin exhales
Riverside's worst air is mostly imported. Through the day a sea breeze off the Pacific pushes the coastal basin's tailpipe and industrial pollution steadily inland, funneling it through the passes toward the Inland Empire. When that dirty air reaches Riverside it runs into the wall of the San Bernardino and San Jacinto mountains, which block its escape and corral it against the slopes.
Summer makes it worse. A layer of warm air sits on top of the cooler air near the ground, a temperature inversion that acts like a lid and stops the smog from mixing out. Under strong sun, the trapped exhaust cooks into ground-level ozone, which is why Riverside's roughest air tends to arrive on hot, still afternoons rather than during a storm.
The warehouse capital's diesel problem
The Inland Empire became one of the country's biggest logistics hubs, and the warehouses that brought jobs also brought thousands of diesel trucks rumbling through Riverside's neighborhoods every day. Researchers at UC Riverside and local groups have documented how that freight traffic layers diesel exhaust and fine particles on top of the region's already heavy ozone, and community advocates have called the corridor a 'diesel death zone' for its asthma and respiratory illness rates.
This is the part of Riverside's air story that has nothing to do with fire and does not take a summer off. It is a year-round, ground-level source concentrated along the freeways and warehouse districts, which is exactly why a single citywide number can hide what your own street is breathing. A sensor near a distribution center can read very differently from one a few miles away.
Fire seasons that reach the valley floor
Riverside also gets the smoke. In July 2020 the Apple Fire burned more than 33,000 acres in Riverside County near Cherry Valley, Beaumont and Banning, throwing up a plume so large it generated its own winds and carried smoke as far as Arizona and San Diego. That September the El Dorado Fire, sparked at a gender-reveal party, burned across the San Bernardino and Riverside county line for weeks.
More recently, the Line and Airport fires of September 2024 pushed smoke across San Bernardino, Riverside, Los Angeles and Orange counties at once, triggering regional smoke advisories. On days like those, the question is not whether the air is bad but how bad and for how long, and that is exactly when a live reading near your home is worth more than a forecast for the whole basin.
Riverside air quality FAQ
What is the air quality in Riverside right now?
As of September 5, 2026 at 5:10 AM PDT, the air quality in Riverside, California is AQI 53 — Moderate — with PM2.5 at 10.1 µg/m³, the median of 4 live PurpleAir sensors. Sensitive groups may want to take it slower outside.
Why is Riverside's air so smoggy even when there are no fires?
Most of Riverside's ozone is not local at all. Afternoon sea breezes carry the Los Angeles Basin's traffic and industrial pollution inland, and the San Bernardino Mountains trap it over the Inland Empire, where summer heat and a temperature inversion cook it into ground-level ozone. The American Lung Association routinely ranks the Riverside-San Bernardino area among the worst in the nation for ozone smog. The Inland Empire's warehouse and diesel-truck traffic adds fine-particle pollution on top of that, year round.
Does wildfire smoke reach Riverside?
Yes. Riverside County has been hit directly by fires like the 33,000-acre Apple Fire near Cherry Valley and Beaumont in July 2020 and the El Dorado Fire that fall, and it also catches smoke drifting down from fires in the surrounding mountains and neighboring counties, as it did during the Line and Airport fires in September 2024. On smoky days the AQI can climb fast, which is why a live reading near your home is more useful than a regional forecast.
What the AQI numbers mean
| AQI | Category | What it means for you |
|---|---|---|
| 0–50 | Good | Open the windows. Great for outdoor activity. |
| 51–100 | Moderate | Sensitive groups may want to take it slower outside. |
| 101–150 | Unhealthy for Sensitive Groups | Kids, elderly, and respiratory conditions stay closer to home. |
| 151–200 | Unhealthy | Skip outdoor exercise. Close windows. |
| 201–300 | Very Unhealthy | Limit time outside. N95 if you must go. |
| 301+ | Hazardous | Health emergency. Stay inside, run filtration if you have it. |
Canairy lets you tighten these bands if you’re more sensitive than the EPA default, so an alert can fire before the official category changes. How to read the Air Quality Index
Where these readings come from
The AQI at the top of this page is the median of the 4 curated PurpleAir sensors Canairy tracks in and around Riverside, with outliers set aside so that one sensor brought indoors — or parked beside a barbecue — cannot set the number for a whole city. Every sensor behind it is listed above with its distance and bearing from the city center. There is no black box here.
In the app, a place you save resolves the same way first. When no neighborhood sensor is reporting it falls back to the nearest EPA AirNow monitor, and anything modeled rather than measured is labelled a regional estimate rather than passed off as a sensor reading. How low-cost sensors compare to regulatory monitors
About Canairy
Canairy is free to download. The free plan covers one saved place with live readings, a plain-English verdict, and push alerts when the air crosses a threshold you choose. Paid plans add more places, faster refreshes, and SMS alerts. It is built by two parents in Sonoma County, California, who got tired of guessing whether it was safe to send the kids outside. Why we built it
Go deeper
Air quality near Riverside
We watch Riverside's air. You live your life.
Set your threshold once and get a heads-up only when the air actually changes for you. Free on the App Store & Google Play.