Port Allen, Louisiana Air Quality
Port Allen has a median AQI of 50, earning an air quality grade of B+ — good air quality that ranks better than 13% of US cities. Air quality has remained relatively stable over the past decade. Particulate matter (PM2.5) is the primary concern, often linked to vehicle traffic, industrial activity, and wildfire smoke. In 2025, Port Allen recorded 138 good air quality days (51% of monitored days) and 1 unhealthy days.
Population: 4,942 • County: West Baton Rouge
Current AQI
Quick Facts
| Current AQI | 19 — Good |
| Air Quality Grade | B+ |
| Median AQI (2025) | 50 |
| vs. U.S. Cities | Better than 13% |
| Primary Pollutant | PM2.5 |
| Unhealthy Days/Year | 1 |
| 10-Year Trend | → Stable |
| Data Source | EPA AQS (historical) · AirNow (live) |
Health Recommendation
Air quality is satisfactory, and air pollution poses little or no risk.
It's a great day to be active outside!
5-Day AQI Forecast
Last 90 Days
Current Pollutant Levels
Real-time data from EPA AirNow
Local Air Quality Context
Air quality data for Port Allen is sourced from the Capitol monitoring area, located approximately 2 miles from city center. This EPA-certified station continuously tracks particulate matter (PM2.5), the primary driver of air quality alerts in this area.
Port Allen tends to see elevated PM2.5 readings during fall and winter months when temperature inversions trap pollutants near the surface. Wood burning, vehicle exhaust, and reduced wind speeds compound the effect. Residents with respiratory conditions should monitor forecasts closely between November and February.
AQI Trend (10 Years)
Air Quality Days by Year
Port Allen Median AQI by Year
Annual EPA air quality data for Port Allen — median AQI, day-category breakdown, and primary pollutant per year.
| Year | Median AQI | Good Days | Unhealthy Days | Max AQI | Primary Pollutant |
|---|---|---|---|---|---|
| 2025 | 50 | 138 | 1 | 112 | PM2.5 |
| 2024 | 49 | 198 | 2 | 101 | PM2.5 |
| 2023 | 52 | 154 | 9 | 140 | PM2.5 |
| 2022 | 46 | 216 | 4 | 105 | PM2.5 |
| 2021 | 46 | 220 | 3 | 150 | PM2.5 |
| 2020 | 44 | 229 | 3 | 101 | PM2.5 |
| 2019 | 47 | 202 | — | 100 | PM2.5 |
| 2018 | 46 | 218 | 3 | 129 | PM2.5 |
| 2017 | 48 | 199 | 3 | 140 | PM2.5 |
| 2016 | 47 | 213 | 2 | 112 | PM2.5 |
Source: EPA Air Quality System (AQS) annual summaries. "Unhealthy Days" includes Unhealthy for Sensitive Groups, Unhealthy, Very Unhealthy, and Hazardous categories.
2025 Air Quality Summary
Primary Pollutant Days (2025)
Days when each pollutant was the primary driver of AQI. Learn about pollutants →
Frequently Asked Questions About Port Allen Air Quality
What is the air quality in Port Allen today?
The current AQI in Port Allen is 19, rated "Good". Air quality is good — outdoor activity is safe for everyone today. Air quality is satisfactory, and air pollution poses little or no risk.
Is air quality in Port Allen getting better or worse?
Air quality in Port Allen has been stable. The median AQI has risen 3 points (from 47 in 2016 to 50 in 2025).
What is the most common air pollutant in Port Allen?
PM2.5 is the primary air pollutant in Port Allen, responsible for 209 days (77% of monitored days) in 2025. Particulate matter originates from vehicle exhaust, wildfires, construction, and industrial activity.
How many unhealthy air days does Port Allen have per year?
In 2025, Port Allen recorded 51% good air quality days (138 days) out of 273 monitored days. There were 1 Unhealthy for Sensitive Groups days and 0 Unhealthy days (AQI above 100). The highest single-day AQI recorded was 112.
What air quality grade does Port Allen receive?
Port Allen receives an air quality grade of B+, placing it better than 13% of US cities. This is based on a median AQI of 50 in 2025, with 138 good air quality days. The EPA monitors air quality in this area continuously using certified monitoring stations.
Air Quality Grade
Better than 13% of US cities
Nearby Cities
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National Rankings
See how Port Allen compares to every other US city by air quality.
Best Air Quality Cities →All city rankingsRecommended Air Purifiers for Port Allen
Port Allen sees its worst PM2.5 during winter temperature inversions when particulates get trapped near ground level. A unit with True HEPA and an auto-mode sensor is most effective for responding to these spikes.
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