What is the air quality trend in Port Arthur?

Over the past 8 days, Port Arthur had an average AQI of 31 based on station measurements. The worst day was 2026-10-20 with AQI 40.

How is Port Arthur air quality measured?

Air quality in Port Arthur 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 Port Arthur, United States

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

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

Current AQI
Moderate Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

141h

PM2.5 Station

141h · 2 stations

Temperature GFS model

27pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-10-21	36	25–52	8.6 µg/m³	4h	2
2026-10-20	40	22–124	10.2 µg/m³	22h	2
2026-10-19	30	15–48	7.2 µg/m³	21h	3
2026-10-18	19	3–58	4.6 µg/m³	22h	2
2026-10-17	33	7–50	7.9 µg/m³	17h	2
2026-10-16	33	13–85	8.4 µg/m³	18h	2
2026-10-15	32	3–76	8.0 µg/m³	21h	2
2026-10-14	27	16–42	6.4 µg/m³	16h	3

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