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Round Lake (Illinois) (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
97.4%
Wind
7 m/s
Pressure
993.7 hPa
Direction
353°
Sunrise
05:00
Sunset
17:00
24h Forecast:
Temp.
-7° / 1°
Precip.
19mm
Max wind
11 m/s

Hourly Forecast

16.03
Now
Weather
1.3
7
16.03
01:00
Weather
2
7
16.03
02:00
Weather
2.3
8
16.03
03:00
Weather
-0°
2.1
8
16.03
04:00
Weather
-1°
0.7
8
16.03
05:00
Weather
-1°
1.1
8
16.03
06:00
Weather
-2°
0.9
8
16.03
07:00
Weather
-2°
0.7
7
16.03
08:00
Weather
-3°
1.1
7
16.03
09:00
Weather
-3°
0.7
9
16.03
10:00
Weather
-4°
1
8
16.03
11:00
Weather
-4°
0.9
9
16.03
12:00
Weather
-5°
0.7
9
16.03
13:00
Weather
-5°
0.6
8
16.03
14:00
Weather
-5°
0.9
9
16.03
15:00
Weather
-5°
0.7
10
16.03
16:00
Weather
-5°
0.5
11
16.03
17:00
Weather
-5°
0.4
11
16.03
18:00
Weather
-5°
0.3
11
16.03
19:00
Weather
-5°
0.1
10
16.03
20:00
Weather
-5°
10
16.03
21:00
Weather
-5°
9
16.03
22:00
Weather
-6°
9
16.03
23:00
Weather
-7°
9

Temperature

1°C
-7°C
00:00
1°C
01:00
1°C
02:00
0°C
03:00
-0°C
04:00
-1°C
05:00
-1°C
06:00
-2°C
07:00
-2°C
08:00
-3°C
09:00
-3°C
10:00
-4°C
11:00
-4°C
12:00
-5°C
13:00
-5°C
14:00
-5°C
15:00
-5°C
16:00
-5°C
17:00
-5°C
18:00
-5°C
19:00
-5°C
20:00
-5°C
21:00
-5°C
22:00
-6°C
23:00
-7°C
00:00 11:00 23:00

Precipitation

2.3mm
0mm
00:00
1.3mm
01:00
2mm
02:00
2.3mm
03:00
2.1mm
04:00
0.7mm
05:00
1.1mm
06:00
0.9mm
07:00
0.7mm
08:00
1.1mm
09:00
0.7mm
10:00
1mm
11:00
0.9mm
12:00
0.7mm
13:00
0.6mm
14:00
0.9mm
15:00
0.7mm
16:00
0.5mm
17:00
0.4mm
18:00
0.3mm
19:00
0.1mm
00:00 11:00 23:00

Wind

11m/s
0m/s
00:00
7.2 m/s
01:00
7.4 m/s
02:00
8 m/s
03:00
8.1 m/s
04:00
8.1 m/s
05:00
7.7 m/s
06:00
7.6 m/s
07:00
7.1 m/s
08:00
7.1 m/s
09:00
8.9 m/s
10:00
8.4 m/s
11:00
8.7 m/s
12:00
8.5 m/s
13:00
8.2 m/s
14:00
8.5 m/s
15:00
10.3 m/s
16:00
10.9 m/s
17:00
11 m/s
18:00
10.5 m/s
19:00
10.4 m/s
20:00
9.7 m/s
21:00
9.4 m/s
22:00
8.7 m/s
23:00
8.7 m/s
00:00 11:00 23:00

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
57.6 km
45
15%

Measurement time: 2026-03-16 01:00

Calculated from PM2.5/PM10

O3
94.1 km
96.37 µg/m3
60.2%

Measurement time: 2026-03-15 23:07

source: OpenWeatherMap

PM2.5
57.6 km
11 µg/m3
13.1%

Measurement time: 2026-03-16 01:00

source: Aqicn

NO2
74.8 km
11.1 µg/m3
5.6%

Measurement time: 2026-03-16 00:00

source: Aqicn

PM10
94.1 km
3.06 µg/m3
2.2%

Measurement time: 2026-03-15 23:07

source: OpenWeatherMap

CO
94.1 km
0.14901 mg/m3
1.1%

Measurement time: 2026-03-15 23:07

source: OpenWeatherMap

SO2
94.1 km
0.86 µg/m3
0.2%

Measurement time: 2026-03-15 23:07

source: OpenWeatherMap

About Air Quality in Round Lake

Air quality in Round Lake 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 Round Lake

  • 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 Round Lake?

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 Round Lake

If you're planning outdoor activities in Round Lake, 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.