Air Quality in San Marcos, El Salvador
Overcast
19.0°C · 98.4% humidity
19.0°
Feels 19.0°
63
Moderate
Unusually sensitive people should consider reducing prolonged outdoor exertion.
Calibrated model
Nearby Monitoring Stations
San Marcos's air quality — share it
AQI Forecast
Calibrated
18
1am
6
6
63
4am
47
35
27
7am
21
11
8
10am
6
4
3
1pm
2
1
1
4pm
7
7
6
7pm
6
0
0
10pm
0
0
Station readings
12h ago
AQI 8
PM2.5 1.9 µg/m³ · 12h ago
CAMS model
adj -48
66
54
54
54
54
54
54
54
34
27
27
27
27
27
34
34
54
54
54
54
34
34
34
34
Air Quality Index Trend
25h · 1 stnSan Marcos's air quality is influenced by vehicle emissions, industrial activity, and seasonal agricultural burning. Pollution patterns vary with dry and wet seasons. Current PM2.5 concentration in San Marcos is 1.2× the WHO 24-hour guideline of 15 µg/m³.
98.4%
Humidity
13.7 km/h
Wind NNW
1013.4 hPa
Pressure
0.7
UV Low
GoodModerateUSGUnhealthyVery UnhealthyHazardous
Which pollutant is driving the AQI?
PM2.5▲
17.89 µg/m³
PM10
27.4 µg/m³
050100150200300500
What is the weather forecast for San Marcos?
Temperature & Precipitation
PM2.5 Trend
25h · 1 stationPM2.517.89 µg/m³
×1.2 WHO
Moderate
PM1027.4 µg/m³
Good
UV INDEX0.7
Low
What is the 7-day forecast for San Marcos?
07-22
29.0° 19.0°
7.5 mm
07-23
28.5° 18.8°
3.31 mm
07-24
30.1° 18.6°
6.69 mm
07-25
28.2° 18.2°
6.62 mm
07-26
28.9° 19.0°
3.81 mm
07-27
26.4° 17.4°
7.81 mm
07-28
30.3° 18.6°
6.56 mm
Both models agree
Avg diff: 3.3°C
Where are air quality stations near San Marcos?
8
el-salvador-centro-histórico-1a-calle-poniente
87
el-salvador-residencial-monte-bello-calle-principal-la-gloria
What cities are near San Marcos?
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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 2026-07-22T10:34 UTC.