What is the air quality in San Marcos today?

The current Air Quality Index (AQI) in San Marcos is 61 (Moderate). PM2.5 concentration is 17.01 µg/m³.

What is the temperature in San Marcos right now?

The current temperature in San Marcos is 26.8°C (feels like 26.8°C). Humidity is 69.5% and wind speed is 3.5 km/h.

Air Quality in San Marcos, El Salvador

Drizzle

26.8°C · 69.5% humidity

26.8°

Feels 26.8°

Moderate

Unusually sensitive people should consider reducing prolonged outdoor exertion.

2 stations

Nearby Monitoring Stations

AQI Forecast

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Station readings

Air Quality Index Trend

39h · 1 stn

View full history →

San 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 1.1× the WHO 24-hour guideline of 15 µg/m³.

69.5%

Humidity

3.5 km/h

Wind WNW

1009.5 hPa

Pressure

0.0

UV Low

GoodModerateUSGUnhealthyVery UnhealthyHazardous

Which pollutant is driving the AQI?

PM2.5▲

17.01 µg/m³

PM10

41.2 µg/m³

050100150200300500

What is the weather forecast for San Marcos?

Temperature & Precipitation

PM2.5 Trend

39h · 1 station

PM2.517.01 µg/m³ ×1.1 WHO

Moderate

PM1041.2 µg/m³

Good

UV INDEX0.0

Low

Station readings (2 stations within 25 km)

17.01

Median

11.37

Average

3.72

Low

19.02

High

PM2.5 µg/m³ · Model: 19.2 · Bias: +2.2

What is the 7-day forecast for San Marcos?

10-21

26.8° 19.7°

8.38 mm

10-22

28.2° 18.9°

6.87 mm

10-23

26.7° 19.1°

4.25 mm

10-24

28.2° 18.9°

8.38 mm

10-25

28.4° 18.8°

5.25 mm

10-26

23.7° 18.2°

11.12 mm

10-27

28.8° 17.3°

0.56 mm

Both models agree Avg diff: 2.9°C

Where are air quality stations near San Marcos?

el-salvador-centro-histórico-1a-calle-poniente

4.8 km PM2.5: 19.0 µg/m³ PM10: 20.0 µg/m³

el-salvador-santa-tecla-pasaje-10

12.2 km 29.5°C 66.7% RH PM2.5: 5.7 µg/m³

What cities are near San Marcos?

65 San Salvador 63 Delgado 64 Mejicanos 61 Soyapango 63 Cuscatancingo 38 Antiguo Cuscatlán 62 Ayutuxtepeque 59 Ilopango 18 Santa Tecla 55 Apopa

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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 2026-10-21T17:03 UTC.