Air Quality in San Marcos, El Salvador
Drizzle
22.2°C · 94.0% humidity
22.2°
Feels 22.2°
97
Moderate
Unusually sensitive people should consider reducing prolonged outdoor exertion.
1 station
Nearby Monitoring Stations
San Marcos's air quality — share it
AQI Forecast
Calibrated
93
12pm
93
93
97
3pm
100
100
100
6pm
100
100
100
9pm
120
120
120
12am
120
120
120
3am
120
120
120
6am
93
93
93
9am
93
93
Station readings
91
101
99
CAMS model
adj +66
27
27
27
27
34
34
34
34
34
34
54
54
54
54
54
54
54
54
54
27
27
27
27
27
Air Quality Index Trend
44h · 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 2.3× the WHO 24-hour guideline of 15 µg/m³.
94.0%
Humidity
22.9 km/h
Wind SSW
1009.7 hPa
Pressure
10.9
UV Extreme
GoodModerateUSGUnhealthyVery UnhealthyHazardous
Which pollutant is driving the AQI?
PM2.5▲
33.8 µg/m³
PM10
20.55 µg/m³
050100150200300500
What is the weather forecast for San Marcos?
Temperature & Precipitation
PM2.5 Trend
44h · 1 stationPM2.533.8 µg/m³
×2.3 WHO
Moderate
PM1020.55 µg/m³
Good
UV INDEX10.9
Extreme
Station readings (1 station within 25 km)
33.8
Median
33.8
Average
33.8
Low
33.8
High
PM2.5 µg/m³ · Model: 10.0 · Bias: -23.8
What is the 7-day forecast for San Marcos?
09-05
24.7° 20.0°
67.63 mm
09-06
29.4° 19.3°
2.5 mm
09-07
30.3° 19.3°
4.0 mm
09-08
30.2° 18.4°
1.5 mm
09-09
26.9° 19.6°
35.19 mm
09-10
31.4° 19.8°
12.0 mm
09-11
30.7° 19.1°
13.88 mm
Both models agree
Avg diff: 3.4°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 2026-09-05T21:24 UTC.