What is the air quality trend in Round Rock?

Over the past 15 days, Round Rock had an average AQI of 13 based on station measurements. The worst day was 2026-07-20 with AQI 28.

How is Round Rock air quality measured?

Air quality in Round Rock 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 Round Rock, United States

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

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

Current AQI
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

311h

PM2.5 Station

311h · 2 stations

Temperature GFS model

56pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	PM10 avg	Hours	Stations
2026-07-21	19	9–33	4.6 µg/m³	6.9	22h	2
2026-07-20	28	16–59	6.8 µg/m³	10.6	24h	2
2026-07-19	24	15–35	5.7 µg/m³	9.2	24h	2
2026-07-18	20	4–39	4.8 µg/m³	7.6	24h	2
2026-07-17	15	4–28	3.5 µg/m³	5.5	24h	2
2026-07-16	17	2–37	3.9 µg/m³	6.0	23h	2
2026-07-15	21	1–51	5.0 µg/m³	7.7	23h	2
2026-07-14	16	1–35	3.9 µg/m³	6.5	20h	2
2026-07-13	2	1–5	0.5 µg/m³	1.3	19h	2
2026-07-12	18	6–41	4.4 µg/m³	6.1	24h	2
2026-07-11	9	2–26	1.9 µg/m³	2.8	23h	2
2026-07-10	4	1–8	0.9 µg/m³	1.8	20h	2
2026-07-09	4	1–9	0.8 µg/m³	1.8	17h	2
2026-07-08	8	1–16	1.9 µg/m³	2.7	23h	2
2026-07-07	3	3–3	0.6 µg/m³	1.0	1h	2

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