What is the air quality trend in Koster?

Over the past 14 days, Koster had an average AQI of 54 based on station measurements. The worst day was 2026-05-18 with AQI 76.

How is Koster air quality measured?

Air quality in Koster 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 Koster, South Africa

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

Historical PM2.5 and AQI trend from monitoring stations near Koster, South Africa.

Current AQI
Good CAMS model

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

191h

PM2.5 Station

191h · 1 station

Temperature GFS model

55pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-05-28	47	2–117	13.4 µg/m³	12h	1
2026-05-27	54	9–153	16.9 µg/m³	12h	1
2026-05-26	56	10–194	21.7 µg/m³	14h	1
2026-05-25	66	1–192	24.9 µg/m³	16h	1
2026-05-24	36	14–56	8.8 µg/m³	12h	2
2026-05-23	62	21–178	24.6 µg/m³	12h	1
2026-05-22	49	8–155	15.5 µg/m³	14h	1
2026-05-21	42	4–97	12.3 µg/m³	11h	1
2026-05-20	49	15–105	14.0 µg/m³	13h	1
2026-05-19	50	7–183	18.3 µg/m³	15h	1
2026-05-18	76	12–500	53.3 µg/m³	14h	1
2026-05-17	51	9–152	15.5 µg/m³	16h	1
2026-05-16	74	9–157	24.9 µg/m³	14h	2
2026-05-15	51	17–152	15.0 µg/m³	16h	1

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