What is the air quality trend in Heidelberg?

Over the past 15 days, Heidelberg had an average AQI of 64 based on station measurements. The worst day was 2026-07-18 with AQI 96.

How is Heidelberg air quality measured?

Air quality in Heidelberg 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 Heidelberg, South Africa

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

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

Current AQI
Moderate CAMS model

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

334h

PM2.5 Station

334h · 3 stations

Temperature GFS model

56pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-07-22	77	53–100	24.4 µg/m³	5h	5
2026-07-21	66	12–147	20.3 µg/m³	24h	8
2026-07-20	78	36–155	25.3 µg/m³	23h	7
2026-07-19	76	29–158	24.8 µg/m³	24h	8
2026-07-18	96	51–165	33.5 µg/m³	24h	8
2026-07-17	94	38–163	32.9 µg/m³	24h	7
2026-07-16	86	53–130	28.4 µg/m³	24h	7
2026-07-15	78	34–125	24.8 µg/m³	24h	7
2026-07-14	58	25–106	16.5 µg/m³	24h	6
2026-07-13	42	15–70	10.3 µg/m³	24h	3
2026-07-12	41	16–71	10.4 µg/m³	24h	3
2026-07-11	51	17–168	15.4 µg/m³	24h	4
2026-07-10	46	12–188	14.9 µg/m³	24h	4
2026-07-09	41	6–154	11.0 µg/m³	24h	4
2026-07-08	37	8–65	9.2 µg/m³	18h	4

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