Air Quality in Costa Mesa, United States

Windy
19.4°C · 64.7% humidity
19.4°
Feels 19.4°
40
Good
Air quality is satisfactory. Enjoy outdoor activities.
5 stations

Nearby Monitoring Stations

AQI Forecast Calibrated
49 3pm
51
50
55 6pm
55
55
55 9pm
55
55
42 12am
42
30
30 3am
30
30
30 6am
30
30
30 9am
30
30
30 12pm
42
30
Station readings
49
51
50
CAMS model adj +5
50
50
50
50
50
50
50
50
50
37
37
25
25
25
25
25
25
25
25
25
25
25
37
25
AD 728×90

PM2.5 Trend (24h)

28h · 109 stations
64.7%
Humidity
62.6 km/h
Wind SSW
1013.5 hPa
Pressure
2.9
UV Moderate
GoodModerateUSGUnhealthyVery UnhealthyHazardous

What is the weather forecast for Costa Mesa?

Temperature & Precipitation

PM2.59.55 µg/m³ ✓ WHO
Good
PM1034.3 µg/m³
Good
UV INDEX2.9
Moderate
AD 300×250
Station readings (5 stations within 25 km)
9.55
Median
9.77
Average
9.38
Low
10.42
High
PM2.5 µg/m³ · Model: 5.9 · Bias: -3.7

What is the 7-day forecast for Costa Mesa?

04-09
20.8° 16.9°
04-10
19.1° 15.9°
13.62 mm
04-11
18.2° 15.0°
15.12 mm
04-12
17.3° 13.6°
0.31 mm
04-13
17.4° 13.8°
0.06 mm
04-14
20.9° 15.4°
04-15
22.0° 17.9°
Both models agree Avg diff: 1.6°C

Where are air quality stations near Costa Mesa?

39
Monroe Elementary
9.6 km PM2.5: 9.4 µg/m³
40
Century High School
11.8 km PM2.5: 9.5 µg/m³
42
Kennedy Elementary
11.9 km PM2.5: 10.1 µg/m³
42
Villa Intermediate
13.1 km PM2.5: 10.1 µg/m³
38
Davis Elementary
13.9 km PM2.5: 9.2 µg/m³

What cities are near Costa Mesa?

40 Newport Beach 40 UC Irvine 40 Huntington Beach 40 Fountain Valley 40 Irvine 40 Tustin Legacy 40 Westpark 40 Woodbridge 40 Santa Ana 40 Tustin

Data sources: AQI from ground-level monitoring stations via AQICN. Weather forecast from ECMWF (IFS & CAMS models). AQI calculated using US EPA standard. Updated 2026-04-09T18:42 UTC.