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Santo Tomás (San Salvador) (SV)

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

Rain showers
31°C
Rain showers
Humidity
30.3%
Wind
5 m/s
Pressure
1009.6 hPa
Direction
185°
Sunrise
05:00
Sunset
17:00
24h Forecast:
Temp.
20° / 32°
Precip.
0.5mm
Max wind
7 m/s

Hourly Forecast

20.03
Now
Weather
31°
0.3
20.03
21:00
Weather
26°
0.2
5
20.03
22:00
Weather
25°
20.03
23:00
Weather
25°
21.03
00:00
Weather
23°
21.03
01:00
Weather
22°
21.03
02:00
Weather
22°
21.03
03:00
Weather
21°
21.03
04:00
Weather
22°
21.03
05:00
Weather
22°
21.03
06:00
Weather
22°
6
21.03
07:00
Weather
21°
7
21.03
08:00
Weather
21°
7
21.03
09:00
Weather
20°
7
21.03
10:00
Weather
20°
7
21.03
11:00
Weather
20°
7
21.03
12:00
Weather
20°
7
21.03
13:00
Weather
21°
7
21.03
14:00
Weather
23°
7
21.03
15:00
Weather
25°
7
21.03
16:00
Weather
27°
6
21.03
17:00
Weather
29°
21.03
18:00
Weather
31°
21.03
19:00
Weather
32°

Temperature

32°C
20°C
20:00
31°C
21:00
26°C
22:00
25°C
23:00
25°C
00:00
23°C
01:00
22°C
02:00
22°C
03:00
21°C
04:00
22°C
05:00
22°C
06:00
22°C
07:00
21°C
08:00
21°C
09:00
20°C
10:00
20°C
11:00
20°C
12:00
20°C
13:00
21°C
14:00
23°C
15:00
25°C
16:00
27°C
17:00
29°C
18:00
31°C
19:00
32°C
20:00 07:00 19:00

Precipitation

0.3mm
0mm
20:00
0.3mm
21:00
0.2mm
20:00 07:00 19:00

Wind

7m/s
0m/s
20:00
4.9 m/s
21:00
5.1 m/s
22:00
4.9 m/s
23:00
3.4 m/s
00:00
3.2 m/s
01:00
3 m/s
02:00
1.9 m/s
03:00
3.2 m/s
04:00
3 m/s
05:00
4.1 m/s
06:00
5.8 m/s
07:00
6.5 m/s
08:00
6.6 m/s
09:00
6.5 m/s
10:00
6.6 m/s
11:00
6.8 m/s
12:00
6.8 m/s
13:00
6.7 m/s
14:00
7 m/s
15:00
6.6 m/s
16:00
5.6 m/s
17:00
4.1 m/s
18:00
3.2 m/s
19:00
5 m/s
20:00 07:00 19:00

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
19.1 km
37
12.3%

Measurement time: 2026-03-20 20:35

Calculated from PM2.5/PM10

O3
19.1 km
80.94 µg/m3
50.6%

Measurement time: 2026-03-20 20:35

source: OpenWeatherMap

PM2.5
19.1 km
8.94 µg/m3
10.6%

Measurement time: 2026-03-20 20:35

source: OpenWeatherMap

PM10
19.1 km
10.85 µg/m3
7.8%

Measurement time: 2026-03-20 20:35

source: OpenWeatherMap

CO
19.1 km
0.14835 mg/m3
1.1%

Measurement time: 2026-03-20 20:35

source: OpenWeatherMap

SO2
19.1 km
1.55 µg/m3
0.4%

Measurement time: 2026-03-20 20:35

source: OpenWeatherMap

NO2
19.1 km
0.21 µg/m3
0.1%

Measurement time: 2026-03-20 20:35

source: OpenWeatherMap

Info

About Air Quality in Santo Tomás

Air quality in Santo Tomás 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 Santo Tomás

  • 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 Santo Tomás?

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 Santo Tomás

If you're planning outdoor activities in Santo Tomás, 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.