What is the air quality trend in Bolton?

Over the past 15 days, Bolton had an average AQI of 42 based on station measurements. The worst day was 2026-05-17 with AQI 57.

How is Bolton air quality measured?

Air quality in Bolton 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 Bolton, Canada

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

Historical PM2.5 and AQI trend from monitoring stations near Bolton, Canada.

Current AQI
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

336h

PM2.5 Station

336h · 11 stations

Temperature GFS model

56pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	PM10 avg	Hours	Stations
2026-05-30	31	12–81	8.1 µg/m³	2.2	15h	7
2026-05-29	50	10–158	14.6 µg/m³	12.1	24h	10
2026-05-28	28	10–81	7.0 µg/m³	1.6	24h	8
2026-05-27	40	17–154	10.8 µg/m³	6.1	24h	8
2026-05-26	35	18–66	8.6 µg/m³	6.0	24h	8
2026-05-25	51	17–163	15.4 µg/m³	11.2	24h	8
2026-05-24	50	18–117	13.7 µg/m³	7.1	24h	9
2026-05-23	41	7–157	12.1 µg/m³	2.7	24h	10
2026-05-22	27	11–72	6.6 µg/m³	5.0	24h	8
2026-05-21	32	6–66	8.0 µg/m³	1.6	24h	9
2026-05-20	53	21–112	15.3 µg/m³	7.2	24h	8
2026-05-19	43	14–118	11.7 µg/m³	8.5	24h	9
2026-05-18	48	25–77	12.1 µg/m³	29.4	24h	7
2026-05-17	57	23–97	16.3 µg/m³	27.7	24h	5
2026-05-16	45	18–95	12.2 µg/m³	14.3	9h	10

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