What is the air quality trend in Chapel Hill?

Over the past 14 days, Chapel Hill had an average AQI of 43 based on station measurements. The worst day was 2026-07-17 with AQI 83.

How is Chapel Hill air quality measured?

Air quality in Chapel Hill 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 Chapel Hill, United States

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

Historical PM2.5 and AQI trend from monitoring stations near Chapel Hill, United States.

Current AQI
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

301h

PM2.5 Station

301h · 5 stations

Temperature GFS model

56pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-07-21	46	18–70	11.7 µg/m³	18h	4
2026-07-20	38	14–70	9.6 µg/m³	22h	2
2026-07-19	42	18–88	10.8 µg/m³	23h	2
2026-07-18	59	6–155	18.4 µg/m³	19h	4
2026-07-17	83	5–218	38.2 µg/m³	22h	3
2026-07-16	66	21–166	22.7 µg/m³	23h	3
2026-07-15	38	17–56	9.1 µg/m³	22h	3
2026-07-14	36	18–55	8.7 µg/m³	24h	3
2026-07-13	40	18–65	9.9 µg/m³	21h	3
2026-07-12	28	15–39	6.8 µg/m³	18h	3
2026-07-11	30	21–48	7.2 µg/m³	23h	3
2026-07-10	34	19–73	8.4 µg/m³	22h	3
2026-07-09	37	23–68	9.1 µg/m³	22h	3
2026-07-08	36	20–52	8.6 µg/m³	22h	4

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