What is the air quality trend in Usulután?

Over the past 8 days, Usulután had an average AQI of 61 based on station measurements. The worst day was 2026-10-17 with AQI 74.

How is Usulután air quality measured?

Air quality in Usulután is measured by ground-level monitoring stations that report PM2.5 and PM10 concentrations hourly. CERNS.IO aggregates readings from nearby stations and converts PM2.5 to the US EPA Air Quality Index (AQI) scale.

Air Quality History for Usulután, El Salvador

Name: Usulután Air Quality History
Creator: CERNS.IO
License: https://creativecommons.org/licenses/by/4.0/

Historical PM2.5 and AQI trend from monitoring stations near Usulután, El Salvador.

Current AQI
Moderate Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

166h

PM2.5 Station

166h · 1 station

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-10-21	56	28–92	15.9 µg/m³	17h	1
2026-10-20	63	10–155	20.5 µg/m³	24h	1
2026-10-19	59	19–141	17.1 µg/m³	24h	1
2026-10-18	52	10–120	14.3 µg/m³	24h	1
2026-10-17	74	35–126	23.1 µg/m³	24h	1
2026-10-16	54	22–91	14.6 µg/m³	23h	1
2026-10-15	71	39–125	21.9 µg/m³	24h	1
2026-10-14	60	38–100	16.9 µg/m³	6h	1

Back to Usulután Air Quality