El Cerrito Corona, California Air Quality

An Air Quality Alert is issued by the National Weather Service on behalf of a state or local agency when pollution is expected to reach a level that harms health. An Air Stagnation Advisory means the air will not move enough to clear what is already in it.

None are in force near El Cerrito Corona right now. All California warnings.

Unhealthy

Nearest monitor

Mira Loma - Van Buren, 11 miles away (site 060658005)

Index measured

174 · Unhealthy

Measured at

Thu, 4:00 PM PDT

Fine particles

28.9 µg/m³

Ozone

118 ppb

Reporting area

Norco and Corona, CA, 1 mile away

Reported by

South Coast AQMD

Measured, not modeled. AirNow observations are preliminary until the operating agency certifies them, which happens months later.

South Coast AQMD's own forecast for Norco and Corona, written by a forecaster rather than read off a model.

NOAA’s National Air Quality Forecast Capability, bias-corrected against monitors, for this town’s own coordinate. The worst hour ahead is an index of 133, Unhealthy for Sensitive Groups, around Thu, 7:00 PM PDT, from the run issued Thu, 5:00 AM PDT. This is a model, not a measurement.

Fine particles in micrograms per cubic meter, ozone in parts per billion as an 8-hour average. The index for each hour is EPA’s: the ozone figure is already the 8-hour average the ozone index is defined on, and the particle figure is run through EPA’s NowCast, which is how an hourly PM2.5 concentration becomes an index.

NOAA’s analysts have not drawn smoke over El Cerrito Corona in satellite imagery today.

NOAA’s model forecasts near-surface smoke peaking at 0.8 µg/m³ around Thu, 7:00 PM PDT.

Smoke on the radar over El Cerrito Corona

Unhealthy

Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects.

Who is affected

Everyone, and sensitive groups more seriously.

What to do

Sensitive groups should avoid long or intense activity outdoors and move exercise indoors. Everyone else should cut it back.

Index range

151 to 200

Category descriptions are the Environmental Protection Agency’s own.

What these numbers are. An index beside a monitor’s name is a measurement, published hourly by AirNow and preliminary until the operating agency certifies it. A category for today or tomorrow is a state or local agency forecaster’s own forecast for a reporting area. An hourly index is NOAA’s air quality model on a five-kilometer grid, not a reading from any instrument. Where a town has no monitor within reach, only the model figures appear, and the page says so.

The nearest towns with a page of their own, closest first.

• Home Gardens, CA3 miles
• Corona, CA3 miles
• Norco, CA6 miles
• Eastvale, CA9 miles
• Pedley, CA10 miles
• Woodcrest, CA10 miles
• Jurupa Valley, CA11 miles
• Riverside, CA11 miles

Observations and daily forecasts from AirNow, the US Environmental Protection Agency’s program with NOAA, the National Park Service, NASA, tribal, state and local agencies. Hourly forecasts from NOAA’s National Air Quality Forecast Capability. Smoke analysis from NOAA’s Hazard Mapping System. Alerts from the National Weather Service. Index categories and breakpoints are EPA’s, as revised in 2024.