SmogRank / United States / Texas

Air quality in Port Arthur

Texas, United States. PM2.5 from 1 reference monitor, updated hourly. None of them reported in the last 24 hours.

6.4µg/m³
Good

Mean for 29 Sept, the most recent day with readings, 0.4× the WHO 24-hour guideline. No hourly readings have reached us since; some networks publish days late.

Rank, worst first

24 hours–not enough data
7 days–not enough data
30 days–not enough data
This year#1,108of 2,176, at 8.7 µg/m³

Why it ranks here

Likely fire smoke. On Sep 25, when Port Arthur averaged 15.7 µg/m³ (its typical day: 7.2), NASA satellites detected 120 fires within 300 km (27 within 100 km). Smoke from those fires is a likely contributor; we don't check which way the wind blew, and mapped smoke can be high above the ground.

Based on Port Arthur's own measurements, with fire detections from NASA FIRMS and smoke maps from NOAA HMS; causes are the usual kinds for a pattern like this, not a confirmed source.

The last 12 months, day by day

1102031Oct 2025NovDecJan 2026FebMarAprMayJunJulAugSep2025-10-01: 15.2 µg/m³2025-10-02: 12.5 µg/m³2025-10-03: 10.8 µg/m³2025-10-04: 10.2 µg/m³2025-10-05: 7.5 µg/m³2025-10-06: 7.3 µg/m³2025-10-07: 4.6 µg/m³2025-10-08: 8.4 µg/m³2025-10-09: 8.8 µg/m³2025-10-10: no data2025-10-11: 11.7 µg/m³2025-10-12: 25.6 µg/m³2025-10-13: 10.1 µg/m³2025-10-14: 12.0 µg/m³2025-10-15: 11.8 µg/m³2025-10-16: 8.9 µg/m³2025-10-17: 5.7 µg/m³2025-10-18: 4.7 µg/m³2025-10-19: no data2025-10-20: no data2025-10-21: 8.0 µg/m³2025-10-22: 6.3 µg/m³2025-10-23: 7.2 µg/m³2025-10-24: 4.3 µg/m³2025-10-25: 5.3 µg/m³2025-10-26: 4.8 µg/m³2025-10-27: 7.7 µg/m³2025-10-28: 6.2 µg/m³2025-10-29: 2.7 µg/m³2025-10-30: 6.2 µg/m³2025-10-31: 7.7 µg/m³2025-11-01: 10.2 µg/m³2025-11-02: 11.9 µg/m³2025-11-03: 6.4 µg/m³2025-11-04: 12.9 µg/m³2025-11-05: 8.0 µg/m³2025-11-06: 6.2 µg/m³2025-11-07: 5.3 µg/m³2025-11-08: 4.3 µg/m³2025-11-09: 3.7 µg/m³2025-11-10: 3.1 µg/m³2025-11-11: 4.9 µg/m³2025-11-12: 3.9 µg/m³2025-11-13: no data2025-11-14: no data2025-11-15: no data2025-11-16: no data2025-11-17: no data2025-11-18: no data2025-11-19: no data2025-11-20: no data2025-11-21: 6.7 µg/m³2025-11-22: 6.7 µg/m³2025-11-23: 6.7 µg/m³2025-11-24: 8.4 µg/m³2025-11-25: 7.3 µg/m³2025-11-26: 5.4 µg/m³2025-11-27: 3.4 µg/m³2025-11-28: 10.7 µg/m³2025-11-29: 6.9 µg/m³2025-11-30: 3.6 µg/m³2025-12-01: 3.3 µg/m³2025-12-02: 3.7 µg/m³2025-12-03: 6.1 µg/m³2025-12-04: 3.8 µg/m³2025-12-05: 5.1 µg/m³2025-12-06: no data2025-12-07: no data2025-12-08: no data2025-12-09: no data2025-12-10: 7.4 µg/m³2025-12-11: 7.1 µg/m³2025-12-12: 6.8 µg/m³2025-12-13: 4.8 µg/m³2025-12-14: 8.2 µg/m³2025-12-15: 4.5 µg/m³2025-12-16: 9.8 µg/m³2025-12-17: 5.6 µg/m³2025-12-18: 3.7 µg/m³2025-12-19: 5.6 µg/m³2025-12-20: 7.9 µg/m³2025-12-21: 6.8 µg/m³2025-12-22: no data2025-12-23: no data2025-12-24: no data2025-12-25: no data2025-12-26: no data2025-12-27: no data2025-12-28: no data2025-12-29: no data2025-12-30: no data2025-12-31: no data2026-01-01: no data2026-01-02: no data2026-01-03: no data2026-01-04: no data2026-01-05: no data2026-01-06: no data2026-01-07: no data2026-01-08: no data2026-01-09: 6.8 µg/m³2026-01-10: 5.1 µg/m³2026-01-11: 3.4 µg/m³2026-01-12: 6.6 µg/m³2026-01-13: 12.8 µg/m³2026-01-14: 7.8 µg/m³2026-01-15: 6.4 µg/m³2026-01-16: 4.8 µg/m³2026-01-17: 3.5 µg/m³2026-01-18: 8.4 µg/m³2026-01-19: 5.5 µg/m³2026-01-20: 7.5 µg/m³2026-01-21: 6.6 µg/m³2026-01-22: 7.7 µg/m³2026-01-23: 11.8 µg/m³2026-01-24: 5.3 µg/m³2026-01-25: no data2026-01-26: no data2026-01-27: no data2026-01-28: 12.6 µg/m³2026-01-29: 11.4 µg/m³2026-01-30: 13.9 µg/m³2026-01-31: 9.4 µg/m³2026-02-01: 7.0 µg/m³2026-02-02: 7.2 µg/m³2026-02-03: 7.4 µg/m³2026-02-04: 8.1 µg/m³2026-02-05: 6.3 µg/m³2026-02-06: 6.1 µg/m³2026-02-07: 9.1 µg/m³2026-02-08: 8.5 µg/m³2026-02-09: 6.6 µg/m³2026-02-10: 6.3 µg/m³2026-02-11: 5.6 µg/m³2026-02-12: 16.6 µg/m³2026-02-13: 7.1 µg/m³2026-02-14: 8.0 µg/m³2026-02-15: 4.3 µg/m³2026-02-16: 5.8 µg/m³2026-02-17: 4.6 µg/m³2026-02-18: 6.6 µg/m³2026-02-19: 10.7 µg/m³2026-02-20: 7.7 µg/m³2026-02-21: 18.0 µg/m³2026-02-22: 11.6 µg/m³2026-02-23: no data2026-02-24: no data2026-02-25: 7.1 µg/m³2026-02-26: 12.3 µg/m³2026-02-27: 18.2 µg/m³2026-02-28: 15.4 µg/m³2026-03-01: 6.3 µg/m³2026-03-02: 5.8 µg/m³2026-03-03: 6.0 µg/m³2026-03-04: 5.1 µg/m³2026-03-05: 4.6 µg/m³2026-03-06: 8.1 µg/m³2026-03-07: 11.2 µg/m³2026-03-08: 4.3 µg/m³2026-03-09: 8.3 µg/m³2026-03-10: 9.4 µg/m³2026-03-11: 9.0 µg/m³2026-03-12: 3.0 µg/m³2026-03-13: no data2026-03-14: no data2026-03-15: no data2026-03-16: no data2026-03-17: 11.4 µg/m³2026-03-18: 4.0 µg/m³2026-03-19: 6.4 µg/m³2026-03-20: 4.8 µg/m³2026-03-21: 7.5 µg/m³2026-03-22: 9.7 µg/m³2026-03-23: 5.1 µg/m³2026-03-24: 6.2 µg/m³2026-03-25: 4.6 µg/m³2026-03-26: 4.4 µg/m³2026-03-27: 5.1 µg/m³2026-03-28: 5.4 µg/m³2026-03-29: 5.5 µg/m³2026-03-30: 7.9 µg/m³2026-03-31: 7.1 µg/m³2026-04-01: 7.6 µg/m³2026-04-02: 8.8 µg/m³2026-04-03: 9.1 µg/m³2026-04-04: 8.3 µg/m³2026-04-05: 3.3 µg/m³2026-04-06: 4.0 µg/m³2026-04-07: 6.1 µg/m³2026-04-08: 6.0 µg/m³2026-04-09: 7.2 µg/m³2026-04-10: 7.5 µg/m³2026-04-11: 7.4 µg/m³2026-04-12: 5.8 µg/m³2026-04-13: 5.8 µg/m³2026-04-14: 7.3 µg/m³2026-04-15: 6.6 µg/m³2026-04-16: 9.0 µg/m³2026-04-17: 7.7 µg/m³2026-04-18: 8.8 µg/m³2026-04-19: 4.1 µg/m³2026-04-20: 15.8 µg/m³2026-04-21: 19.0 µg/m³2026-04-22: 27.5 µg/m³2026-04-23: 25.4 µg/m³2026-04-24: 25.8 µg/m³2026-04-25: 21.3 µg/m³2026-04-26: 22.1 µg/m³2026-04-27: 27.1 µg/m³2026-04-28: 28.0 µg/m³2026-04-29: 27.8 µg/m³2026-04-30: 20.7 µg/m³2026-05-01: 11.3 µg/m³2026-05-02: no data2026-05-03: no data2026-05-04: no data2026-05-05: 6.9 µg/m³2026-05-06: 9.6 µg/m³2026-05-07: 7.1 µg/m³2026-05-08: 6.1 µg/m³2026-05-09: 7.8 µg/m³2026-05-10: 6.4 µg/m³2026-05-11: 6.7 µg/m³2026-05-12: 9.7 µg/m³2026-05-13: 10.7 µg/m³2026-05-14: 11.9 µg/m³2026-05-15: 7.7 µg/m³2026-05-16: 7.5 µg/m³2026-05-17: 9.2 µg/m³2026-05-18: 8.8 µg/m³2026-05-19: 6.8 µg/m³2026-05-20: 5.9 µg/m³2026-05-21: 3.4 µg/m³2026-05-22: 5.3 µg/m³2026-05-23: 4.4 µg/m³2026-05-24: 4.8 µg/m³2026-05-25: 7.4 µg/m³2026-05-26: 3.6 µg/m³2026-05-27: no data2026-05-28: 6.0 µg/m³2026-05-29: 9.3 µg/m³2026-05-30: 7.7 µg/m³2026-05-31: 9.0 µg/m³2026-06-01: 7.7 µg/m³2026-06-02: 8.9 µg/m³2026-06-03: 5.9 µg/m³2026-06-04: 5.1 µg/m³2026-06-05: 5.7 µg/m³2026-06-06: 9.5 µg/m³2026-06-07: 14.3 µg/m³2026-06-08: 9.3 µg/m³2026-06-09: 5.0 µg/m³2026-06-10: 5.3 µg/m³2026-06-11: 5.5 µg/m³2026-06-12: 8.3 µg/m³2026-06-13: 11.4 µg/m³2026-06-14: 12.4 µg/m³2026-06-15: 8.7 µg/m³2026-06-16: 5.0 µg/m³2026-06-17: 7.2 µg/m³2026-06-18: 20.7 µg/m³2026-06-19: no data2026-06-20: no data2026-06-21: no data2026-06-22: no data2026-06-23: no data2026-06-24: 18.8 µg/m³2026-06-25: 17.9 µg/m³2026-06-26: 9.8 µg/m³2026-06-27: 14.3 µg/m³2026-06-28: 14.6 µg/m³2026-06-29: 14.7 µg/m³2026-06-30: 8.3 µg/m³2026-07-01: 9.4 µg/m³2026-07-02: 7.5 µg/m³2026-07-03: 9.6 µg/m³2026-07-04: 9.2 µg/m³2026-07-05: 6.3 µg/m³2026-07-06: 5.9 µg/m³2026-07-07: 7.7 µg/m³2026-07-08: 7.1 µg/m³2026-07-09: 6.1 µg/m³2026-07-10: 9.6 µg/m³2026-07-11: 15.3 µg/m³2026-07-12: 7.6 µg/m³2026-07-13: 9.7 µg/m³2026-07-14: 9.8 µg/m³2026-07-15: 15.2 µg/m³2026-07-16: 20.3 µg/m³2026-07-17: 15.1 µg/m³2026-07-18: 15.7 µg/m³2026-07-19: 16.1 µg/m³2026-07-20: 18.2 µg/m³2026-07-21: 17.6 µg/m³2026-07-22: 18.6 µg/m³2026-07-23: 5.4 µg/m³2026-07-24: 10.2 µg/m³2026-07-25: 3.5 µg/m³2026-07-26: 2.5 µg/m³2026-07-27: 2.3 µg/m³2026-07-28: 8.5 µg/m³2026-07-29: 4.4 µg/m³2026-07-30: 2.3 µg/m³2026-07-31: 5.7 µg/m³2026-08-01: 10.3 µg/m³2026-08-02: 7.8 µg/m³2026-08-03: 7.9 µg/m³2026-08-04: 20.4 µg/m³2026-08-05: 11.8 µg/m³2026-08-06: 5.5 µg/m³2026-08-07: no data2026-08-08: no data2026-08-09: no data2026-08-10: no data2026-08-11: 2.4 µg/m³2026-08-12: 1.2 µg/m³2026-08-13: no data2026-08-14: no data2026-08-15: no data2026-08-16: no data2026-08-17: no data2026-08-18: no data2026-08-19: no data2026-08-20: no data2026-08-21: no data2026-08-22: 3.8 µg/m³2026-08-23: 4.2 µg/m³2026-08-24: 3.8 µg/m³2026-08-25: 2.0 µg/m³2026-08-26: 2.1 µg/m³2026-08-27: 8.8 µg/m³2026-08-28: 3.4 µg/m³2026-08-29: 2.6 µg/m³2026-08-30: 5.6 µg/m³2026-08-31: 8.0 µg/m³2026-09-01: 1.8 µg/m³2026-09-02: 2.0 µg/m³2026-09-03: 1.9 µg/m³2026-09-04: 2.2 µg/m³2026-09-05: 5.0 µg/m³2026-09-06: 8.0 µg/m³2026-09-07: 7.6 µg/m³2026-09-08: 4.3 µg/m³2026-09-09: no data2026-09-10: no data2026-09-11: no data2026-09-12: no data2026-09-13: no data2026-09-14: no data2026-09-15: no data2026-09-16: 6.2 µg/m³2026-09-17: 7.3 µg/m³2026-09-18: 5.7 µg/m³2026-09-19: 5.5 µg/m³2026-09-20: 4.7 µg/m³2026-09-21: 6.5 µg/m³2026-09-22: no data2026-09-23: no data2026-09-24: 10.5 µg/m³2026-09-25: 15.7 µg/m³. Likely fire smoke2026-09-26: no data2026-09-27: no data2026-09-28: no data2026-09-29: 6.4 µg/m³2026-09-30: no data
31 of 288 measured days were over the WHO 24-hour guideline (15 µg/m³). One row per month, one square per local day; outlined days are named in the notes above.
Good0–9.0
Moderate9.1–35.4
Sensitive groups35.5–55.4
Unhealthy55.5–125.4
Very unhealthy125.5–225.4
Hazardous225.5+

Hour by hour

No hourly readings in the last few days. The chart returns when the monitors' data arrives.

Its world rank, day by day

#1#2367OctNovDecJanFebMarAprMayJunJulAugSep
Rank on each day's board (1 = most polluted city that day).

2026 against 2025, month by month

15Jan 2025: 10.3 µg/m³Jan 2026: 7.9 µg/m³JanFeb 2025: 15.1 µg/m³Feb 2026: 8.9 µg/m³FebMar 2025: 8.7 µg/m³Mar 2026: 6.5 µg/m³MarApr 2025: 8.9 µg/m³Apr 2026: 13.0 µg/m³AprMay 2025: 7.9 µg/m³May 2026: 7.4 µg/m³MayJun 2025: 9.1 µg/m³Jun 2026: 10.2 µg/m³JunJul 2025: 11.4 µg/m³Jul 2026: 9.8 µg/m³JulAug 2025: 8.0 µg/m³Aug 2026: 6.2 µg/m³AugSep 2025: 8.9 µg/m³Sep 2026: 6.0 µg/m³SepOct 2025: 8.6 µg/m³OctNov 2025: 6.7 µg/m³NovDec 2025: 5.9 µg/m³Dec
Faded bars: 2025. A month shows once it has 10 measured days.

Monitors

StationOperatorType
Thomas Jefferson SchUS Public DomainAirNowReference

The city's value is the median of its reference monitors each hour, when at least a third of them report (three are always enough); low-cost sensors are listed but not counted when reference monitors exist. Data via OpenAQ; licences as listed. How we rank. Embed this on your site.

Use this page

SmogRank, PM2.5 daily means, Port Arthur, United States, 1 Oct 2025 – 30 Sep 2026, smogrank.com/us/port-arthur (accessed 2 Oct 2026).

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Other cities in United States

30-day averages, µg/m³. All of United States.

Updated 2026-10-01 23:07 UTC. Values are PM2.5 in µg/m³ (fine particles), the median of each city's monitors.