St. James, Louisiana Air Quality
St. James County, Louisiana (LA)
→ Stableover 10 years
10-Year AQI Trend
The solid line shows the median AQI each year. The dashed line shows the 90th percentile (worst 10% of days).
Air Quality Day Breakdown
Number of days per year in each EPA AQI category. Green = Good (AQI 0-50), Yellow = Moderate (51-100), Orange = Unhealthy for Sensitive Groups (101-150), Red = Unhealthy or worse (151+).
Year-by-Year Data
| Year | Median AQI | 90th Pct | Max AQI | Good Days | Moderate | Unhealthy+ | Pollutant |
|---|---|---|---|---|---|---|---|
| 2023 | 33 | 51 | 115 | 314 | 35 | 2 | Ozone |
| 2022 | 32 | 46 | 93 | 345 | 16 | 0 | Ozone |
| 2021 | 28 | 41 | 58 | 326 | 4 | 0 | Ozone |
| 2020 | 29 | 44 | 90 | 351 | 6 | 0 | Ozone |
| 2019 | 29 | 46 | 97 | 344 | 15 | 0 | Ozone |
| 2018 | 27 | 44 | 93 | 350 | 14 | 0 | Ozone |
| 2017 | 31 | 46 | 80 | 349 | 16 | 0 | Ozone |
| 2016 | 31 | 46 | 84 | 347 | 19 | 0 | Ozone |
| 2015 | 31 | 46 | 115 | 325 | 18 | 2 | Ozone |
| 2014 | 33 | 48 | 154 | 318 | 25 | 1 | Ozone |
What This Means for St. James County Residents
St. James, Louisiana has received an Air Quality Grade of B (71/100) based on a decade of EPA monitoring data. The current median AQI of 33 falls in the "Good" range.
The primary pollutant affecting this area is Ground-Level Ozone. Over the past 5 years, this area has averaged 0 unhealthy air quality days per year — days when sensitive groups (children, elderly, those with respiratory conditions) should limit outdoor activity.