What is the air quality trend in Roy?

Over the past 15 days, Roy had an average AQI of 48 based on station measurements. The worst day was 2026-07-17 with AQI 90.

How is Roy air quality measured?

Air quality in Roy 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 Roy, United States

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

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

Current AQI
Moderate Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

336h

PM2.5 Station

336h · 7 stations

Temperature GFS model

56pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-07-21	48	18–75	12.8 µg/m³	23h	5
2026-07-20	52	20–87	13.6 µg/m³	24h	5
2026-07-19	51	31–78	13.5 µg/m³	24h	5
2026-07-18	47	20–77	12.2 µg/m³	24h	5
2026-07-17	90	31–163	32.1 µg/m³	24h	6
2026-07-16	62	21–181	20.7 µg/m³	24h	6
2026-07-15	46	30–88	11.9 µg/m³	24h	5
2026-07-14	54	28–197	17.7 µg/m³	24h	6
2026-07-13	35	11–62	8.5 µg/m³	24h	5
2026-07-12	39	20–88	9.7 µg/m³	24h	5
2026-07-11	41	21–68	10.1 µg/m³	24h	5
2026-07-10	49	5–212	18.2 µg/m³	24h	4
2026-07-09	41	16–198	14.0 µg/m³	24h	6
2026-07-08	37	22–58	8.9 µg/m³	24h	5
2026-07-07	30	30–30	7.1 µg/m³	1h	5

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