What is the air quality trend in Placentia?

Over the past 8 days, Placentia had an average AQI of 41 based on station measurements. The worst day was 2026-07-20 with AQI 49.

How is Placentia air quality measured?

Air quality in Placentia 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 Placentia, United States

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

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

Current AQI
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

168h

PM2.5 Station

168h · 2 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	36	16–52	8.7 µg/m³	4.1	22h	120
2026-07-20	49	42–54	11.8 µg/m³	7.1	24h	121
2026-07-19	47	38–53	11.3 µg/m³	7.9	24h	127
2026-07-18	41	35–44	9.8 µg/m³	5.4	24h	127
2026-07-17	45	35–54	10.8 µg/m³	9.5	24h	132
2026-07-16	42	35–77	10.4 µg/m³	5.6	24h	122
2026-07-15	40	33–50	9.6 µg/m³	5.3	24h	128
2026-07-14	30	23–36	7.1 µg/m³	6.4	2h	68

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