What is the air quality in Costa Mesa today?

The current Air Quality Index (AQI) in Costa Mesa is 12 (Good). PM2.5 concentration is 3.0 µg/m³.

What is the temperature in Costa Mesa right now?

The current temperature in Costa Mesa is 28.5°C (feels like 28.5°C). Humidity is 32.2% and wind speed is 20.5 km/h.

Is it safe to go outside in Costa Mesa?

Air quality is satisfactory. Enjoy outdoor activities. The UV Index is 0.0 (Low).

Air Quality in Costa Mesa, United States

Clear

28.5°C · 32.2% humidity

28.5°

Feels 28.5°

Good

Air quality is satisfactory. Enjoy outdoor activities.

Calibrated model

Nearby Monitoring Stations

AQI Forecast

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Air Quality Index Trend

44h · 106 stn

View full history →

Costa Mesa's air quality is primarily affected by vehicle emissions and industrial activity. Seasonal wildfire smoke and weather patterns can cause periodic air quality deterioration.

32.2%

Humidity

20.5 km/h

Wind SW

1015.3 hPa

Pressure

0.0

UV Low

GoodModerateUSGUnhealthyVery UnhealthyHazardous

Which pollutant is driving the AQI?

PM2.5

3.0 µg/m³

PM10▲

13.7 µg/m³

050100150200300500

What is the weather forecast for Costa Mesa?

Temperature & Precipitation

PM2.5 Trend

44h · 106 stations

PM2.53.0 µg/m³ ✓ WHO

Good

PM1013.7 µg/m³

Good

UV INDEX0.0

Low

What is the 7-day forecast for Costa Mesa?

10-20

28.5° 22.3°

10-21

24.7° 20.7°

10-22

31.7° 21.4°

10-23

23.6° 21.3°

10-24

23.5° 19.6°

0.13 mm

10-25

28.7° 18.2°

0.06 mm

10-26

25.5° 19.8°

1.37 mm

Both models agree Avg diff: 4.8°C

Where are air quality stations near Costa Mesa?

Monroe Elementary

9.6 km PM2.5: 2.0 µg/m³

Century High School

11.8 km PM2.5: 7.0 µg/m³

Kennedy Elementary

11.9 km PM2.5: 4.8 µg/m³

Villa Intermediate

13.1 km PM2.5: 2.7 µg/m³

Davis Elementary

13.9 km PM2.5: 2.7 µg/m³

What cities are near Costa Mesa?

12 Newport Beach 12 UC Irvine 12 Huntington Beach 38 Fountain Valley 12 Irvine 38 Tustin Legacy 12 Westpark 12 Woodbridge 38 Santa Ana 38 Tustin

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ModerateAQI > 50 Unhealthy for Sensitive GroupsAQI > 100 UnhealthyAQI > 150 Very UnhealthyAQI > 200

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Data sources: AQI from ground-level monitoring stations via AQICN. Weather forecast from ECMWF (IFS & CAMS models). AQI calculated using US EPA standard. Updated 2026-10-20T20:05 UTC.