What is the air quality trend in Heidelberg?

Over the past 7 days, Heidelberg had an average AQI of 79 based on station measurements. The worst day was 2026-07-17 with AQI 91.

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

167h

PM2.5 Station

167h · 5 stations

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	PM10 avg	Hours	Stations
2026-07-21	68	26–130	21.2 µg/m³	—	23h	8
2026-07-20	74	26–153	23.7 µg/m³	—	24h	8
2026-07-19	76	26–154	24.4 µg/m³	74.6	24h	9
2026-07-18	91	32–154	31.0 µg/m³	119.3	24h	9
2026-07-17	91	43–133	30.6 µg/m³	127.0	24h	9
2026-07-16	82	41–140	26.4 µg/m³	110.4	24h	8
2026-07-15	76	28–133	24.2 µg/m³	121.1	24h	8

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