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Williamstown (New Jersey) (US)

Air Quality Trend (last 7 days)

Good (0-50)
Moderate (51-100)
Unhealthy for Sensitive Groups (101-150)
Unhealthy (151-200)
Very Unhealthy (201-300)
Hazardous (300+)

Weather - 48h MET Norway

Heavy sleet
1°C
Heavy sleet
Humidity
99.6%
Wind
8 m/s
Pressure
1010 hPa
Direction
55°
Sunrise
05:00
Sunset
17:00
24h Forecast:
Temp.
-2° / 2°
Precip.
23.5mm
Max wind
8.9 m/s

Hourly Forecast

22.02
Now
Weather
1.6
8
22.02
22:00
Weather
1.3
7
22.02
23:00
Weather
1.2
7
23.02
00:00
Weather
1.6
7
23.02
01:00
Weather
-0°
1.7
7
23.02
02:00
Weather
-1°
1.4
8
23.02
03:00
Weather
-1°
1.9
8
23.02
04:00
Weather
-1°
1.8
9
23.02
05:00
Weather
-1°
1.2
8
23.02
06:00
Weather
-1°
1.4
9
23.02
07:00
Weather
-1°
1.6
8
23.02
08:00
Weather
-1°
1.5
8
23.02
09:00
Weather
-1°
1.1
8
23.02
10:00
Weather
-1°
0.8
8
23.02
11:00
Weather
-1°
0.7
7
23.02
12:00
Weather
-2°
0.5
7
23.02
13:00
Weather
-1°
0.5
7
23.02
14:00
Weather
-1°
0.4
7
23.02
15:00
Weather
-1°
0.2
7
23.02
16:00
Weather
-0°
0.3
6
23.02
17:00
Weather
0.3
6
23.02
18:00
Weather
0.3
7
23.02
19:00
Weather
0.2
6
23.02
20:00
Weather
6

Temperature

2°C
-2°C
21:00
1°C
22:00
1°C
23:00
0°C
00:00
0°C
01:00
-0°C
02:00
-1°C
03:00
-1°C
04:00
-1°C
05:00
-1°C
06:00
-1°C
07:00
-1°C
08:00
-1°C
09:00
-1°C
10:00
-1°C
11:00
-1°C
12:00
-2°C
13:00
-1°C
14:00
-1°C
15:00
-1°C
16:00
-0°C
17:00
0°C
18:00
1°C
19:00
2°C
20:00
2°C
21:00 08:00 20:00

Precipitation

1.9mm
0mm
21:00
1.6mm
22:00
1.3mm
23:00
1.2mm
00:00
1.6mm
01:00
1.7mm
02:00
1.4mm
03:00
1.9mm
04:00
1.8mm
05:00
1.2mm
06:00
1.4mm
07:00
1.6mm
08:00
1.5mm
09:00
1.1mm
10:00
0.8mm
11:00
0.7mm
12:00
0.5mm
13:00
0.5mm
14:00
0.4mm
15:00
0.2mm
16:00
0.3mm
17:00
0.3mm
18:00
0.3mm
19:00
0.2mm
21:00 08:00 20:00

Wind

8.9m/s
0m/s
21:00
8.1 m/s
22:00
7 m/s
23:00
6.7 m/s
00:00
6.9 m/s
01:00
7.2 m/s
02:00
7.7 m/s
03:00
8.3 m/s
04:00
8.6 m/s
05:00
8.4 m/s
06:00
8.9 m/s
07:00
8.4 m/s
08:00
8.1 m/s
09:00
8.2 m/s
10:00
8 m/s
11:00
7.3 m/s
12:00
7 m/s
13:00
6.8 m/s
14:00
6.6 m/s
15:00
6.5 m/s
16:00
6.2 m/s
17:00
6 m/s
18:00
6.5 m/s
19:00
5.7 m/s
20:00
6 m/s
21:00 08:00 20:00

Radiation

No sensor within 100 km.

We display the worst measurements from all stations in the area. This approach provides a more cautious assessment of air quality, accounting for local pollution sources.

AQI
56.6 km
33
11%

Measurement time: 2026-02-22 21:00

Calculated from PM2.5/PM10

O3
62.5 km
71.64 µg/m3
44.8%

Measurement time: 2026-02-22 21:59

source: OpenWeatherMap

PM2.5
56.6 km
8 µg/m3
9.5%

Measurement time: 2026-02-22 21:00

source: Aqicn

NO2
62.5 km
7.9 µg/m3
4%

Measurement time: 2026-02-22 21:59

source: OpenWeatherMap

PM10
62.5 km
4.67 µg/m3
3.3%

Measurement time: 2026-02-22 21:59

source: OpenWeatherMap

CO
62.5 km
0.23037 mg/m3
1.6%

Measurement time: 2026-02-22 21:59

source: OpenWeatherMap

SO2
62.5 km
0.79 µg/m3
0.2%

Measurement time: 2026-02-22 21:59

source: OpenWeatherMap

Info


Region: New Jersey
Latitude: 39.68623
Longitude: -74.99517


Solar Energy

Very low
31 W/m²
Solar Radiation
Solar Calculator
Calculate energy production for Williamstown

About Air Quality in Williamstown

Air quality in Williamstown is monitored in real-time by sensors and measurement stations. On this page you'll find current data on major air pollutants including particulate matter PM2.5 and PM10, nitrogen dioxide (NO2), ozone (O3), and radiation levels.

Common Pollutants in Williamstown

  • PM2.5 - fine particulate matter up to 2.5 micrometers, particularly harmful to health
  • PM10 - particulate matter up to 10 micrometers from traffic and industry
  • NO2 - nitrogen dioxide mainly emitted by vehicles
  • O3 - tropospheric ozone formed in photochemical reactions

When is Air Quality Best in Williamstown?

Generally, the best air quality occurs:

  • Early morning (5:00-7:00 AM) before rush hour traffic
  • After rainfall which cleanses the atmosphere
  • During strong winds that disperse pollutants
  • In summer months when heating systems are less used

Tips for Runners in Williamstown

If you're planning outdoor activities in Williamstown, always check the current AQI value. When AQI exceeds 100, consider moving your workout indoors or shortening the distance. People with respiratory issues, children, and seniors should be especially cautious during elevated pollution levels. Choose routes away from busy streets and industrial areas.