Air Quality in Horsham, United Kingdom
Drizzle
15.8°C · 62.4% humidity
15.8°
Feels 15.8°
17
Good
Air quality is satisfactory. Enjoy outdoor activities.
2 stations
Nearby Monitoring Stations
Horsham's air quality — share it
AQI Forecast
Calibrated
11
1pm
4
4
17
4pm
15
14
13
7pm
33
32
44
10pm
44
43
43
1am
31
31
31
4am
31
31
31
7am
11
11
11
10am
11
11
Station readings
8
12
12
CAMS model
adj -23
34
27
27
34
34
34
34
54
54
66
66
66
66
54
54
54
54
54
54
34
34
34
34
34
Air Quality Index Trend
18h · 1 stnHorsham's air quality is shaped by traffic emissions and residential heating. Pollution levels tend to peak during winter months when cold air traps emissions close to ground level.
62.4%
Humidity
21.3 km/h
Wind ESE
1029.2 hPa
Pressure
5.9
UV High
GoodModerateUSGUnhealthyVery UnhealthyHazardous
Which pollutant is driving the AQI?
PM2.5▲
4.03 µg/m³
PM10
13.7 µg/m³
050100150200300500
What is the weather forecast for Horsham?
Temperature & Precipitation
PM2.5 Trend
18h · 1 stationPM2.54.03 µg/m³
✓ WHO
Good
PM1013.7 µg/m³
Good
UV INDEX5.9
High
Station readings (2 stations within 25 km)
4.03
Median
3.9
Average
2.5
Low
5.3
High
PM2.5 µg/m³ · Model: 7.1 · Bias: +3.1
What is the 7-day forecast for Horsham?
09-05
17.8° 11.3°
0.13 mm
09-06
17.8° 10.6°
0.19 mm
09-07
16.0° 12.4°
0.81 mm
09-08
22.5° 9.0°
1.0 mm
09-09
17.7° 8.8°
0.19 mm
09-10
19.7° 15.7°
0.38 mm
09-11
17.6° 12.0°
0.06 mm
Both models agree
Avg diff: 3.0°C
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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 2026-09-05T15:11 UTC.