Air Quality in Westminster, United States

Windy
26.7°C · 68.3% humidity
26.7°
Feels 26.7°
68
Moderate
Unusually sensitive people should consider reducing prolonged outdoor exertion.
Model forecast

Nearby Monitoring Stations

AQI Forecast
54 5am
54
54
68 8am
76
73
71 11am
70
69
68 2pm
67
67
67 5pm
54
54
54 8pm
54
54
34 11pm
34
54
54 2am
54
54
AD 728×90

Air Quality Index Trend

45h · 166 stn

Westminster's air quality is primarily affected by vehicle emissions and industrial activity. Seasonal wildfire smoke and weather patterns can cause periodic air quality deterioration. Current PM2.5 concentration in Westminster is 1.4× the WHO 24-hour guideline of 15 µg/m³.

68.3%
Humidity
42.1 km/h
Wind WSW
1016.0 hPa
Pressure
2.2
UV Moderate
GoodModerateUSGUnhealthyVery UnhealthyHazardous

Which pollutant is driving the AQI?

PM2.5▲
68
20.3 µg/m³
PM10
60
73.05 µg/m³
050100150200300500

What is the weather forecast for Westminster?

Temperature & Precipitation

PM2.5 Trend

45h · 166 stations
PM2.520.3 µg/m³ ×1.4 WHO
Moderate
PM1073.05 µg/m³
Moderate
UV INDEX2.2
Moderate
AD 300×250

What is the 7-day forecast for Westminster?

09-05
26.7° 23.3°
09-06
29.4° 21.6°
09-07
28.9° 23.6°
09-08
26.9° 20.3°
0.38 mm
09-09
30.5° 21.1°
09-10
28.0° 19.4°
09-11
31.8° 22.1°
Both models agree Avg diff: 2.8°C

Where are air quality stations near Westminster?

30
Wilmington Pk ES (7781)
22.3 km PM2.5: 7.3 µg/m³
41
Watson Yard
23.3 km PM2.5: 9.9 µg/m³
33
Wilmington Public Library - Outside
23.9 km PM2.5: 7.9 µg/m³
18
Wilmington Public Library - Inside
24.1 km PM2.5: 4.2 µg/m³
32
Bonita ES (2473)
24.7 km PM2.5: 7.7 µg/m³
31
Curtiss MS (8103)
24.8 km PM2.5: 7.4 µg/m³
37
Gulf ES (4315)
24.8 km PM2.5: 8.9 µg/m³
51
Dolores ES (3452)
25.5 km PM2.5: 12.2 µg/m³
32
Bryson ES (2589)
26.8 km PM2.5: 7.6 µg/m³
35
Ambler ES (2089)
27.8 km PM2.5: 8.5 µg/m³

What cities are near Westminster?

74 Stanton 42 Garden Grove 74 Cypress 42 Fountain Valley 54 Seal Beach 74 La Palma 28 Huntington Beach 48 Anaheim 74 Buena Park 74 Cerritos
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Data sources: Weather forecast from ECMWF (IFS & CAMS models). AQI calculated using US EPA standard. Updated 2026-09-05T15:06 UTC.