What is the air quality trend in Alajuela?

Over the past 20 days, Alajuela had an average AQI of 26 based on station measurements. The worst day was 2026-05-11 with AQI 30.

How is Alajuela air quality measured?

Air quality in Alajuela 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 Alajuela, Costa Rica

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

Historical PM2.5 and AQI trend from monitoring stations near Alajuela, Costa Rica.

Current AQI
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

475h

PM2.5 Station

475h · 1 station

Temperature GFS model

80pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-05-29	27	23–31	6.6 µg/m³	24h	1
2026-05-28	25	22–30	6.0 µg/m³	22h	1
2026-05-27	25	20–30	6.0 µg/m³	24h	1
2026-05-26	24	21–26	5.6 µg/m³	24h	1
2026-05-25	24	22–28	5.8 µg/m³	24h	1
2026-05-24	27	23–32	6.5 µg/m³	24h	1
2026-05-23	28	26–30	6.6 µg/m³	24h	1
2026-05-22	28	25–32	6.8 µg/m³	23h	1
2026-05-21	26	22–35	6.3 µg/m³	24h	1
2026-05-20	22	20–28	5.4 µg/m³	24h	1
2026-05-19	27	24–30	6.4 µg/m³	24h	1
2026-05-18	26	25–28	6.3 µg/m³	24h	1
2026-05-17	27	25–30	6.4 µg/m³	24h	1
2026-05-16	26	23–29	6.1 µg/m³	24h	1
2026-05-15	29	24–33	6.8 µg/m³	24h	1
2026-05-14	27	23–32	6.5 µg/m³	24h	1
2026-05-13	26	22–30	6.1 µg/m³	24h	1
2026-05-12	25	22–32	5.9 µg/m³	24h	1
2026-05-11	30	28–36	7.1 µg/m³	24h	1
2026-05-10	28	26–30	6.6 µg/m³	22h	1

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