Air Quality in Saint Louis, Missouri
43
Median AQI (2024)
122
Max AQI (2024)
↓ improving
10-Year Trend
Ozone
Primary Pollutant
266
Good Days (2024)
23
Monitoring Stations
AQI Trend (Median)
Air Quality Days by Category
Annual Summary
| Year | Median AQI | Max AQI | Good Days | Moderate Days | Unhealthy Days | Ozone Days | PM2.5 Days |
|---|---|---|---|---|---|---|---|
| 2024 | 43 | 122 | 266 | 94 | 2 | 197 | 153 |
| 2023 | 46 | 166 | 218 | 130 | 17 | 168 | 184 |
| 2022 | 44 | 140 | 263 | 100 | 2 | 181 | 171 |
| 2021 | 42 | 126 | 251 | 111 | 3 | 153 | 192 |
| 2020 | 44 | 144 | 246 | 114 | 6 | 164 | 183 |
| 2019 | 49 | 143 | 194 | 168 | 3 | 130 | 234 |
| 2018 | 51 | 119 | 178 | 181 | 6 | 126 | 221 |
| 2017 | 52 | 147 | 161 | 203 | 1 | 132 | 227 |
| 2016 | 48 | 136 | 205 | 154 | 7 | 122 | 218 |
| 2015 | 52 | 119 | 172 | 188 | 5 | 90 | 251 |
Recent Daily AQI
| Date | AQI | Category | Primary Pollutant |
|---|---|---|---|
| Dec 30, 2024 | 33 | Good | PM2.5 |
| Dec 29, 2024 | 37 | Good | PM2.5 |
| Dec 28, 2024 | 39 | Good | PM2.5 |
| Dec 27, 2024 | 24 | Good | PM2.5 |
| Dec 26, 2024 | 56 | Moderate | PM2.5 |
| Dec 25, 2024 | 58 | Moderate | PM2.5 |
| Dec 24, 2024 | 62 | Moderate | PM2.5 |
| Dec 23, 2024 | 27 | Good | PM2.5 |
| Dec 22, 2024 | 39 | Good | PM2.5 |
| Dec 21, 2024 | 35 | Good | NO2 |
| Dec 20, 2024 | 50 | Good | PM2.5 |
| Dec 19, 2024 | 37 | Good | PM2.5 |
| Dec 18, 2024 | 36 | Good | PM2.5 |
| Dec 17, 2024 | 28 | Good | NO2 |
| Dec 16, 2024 | 22 | Good | PM2.5 |
| Dec 15, 2024 | 23 | Good | PM2.5 |
| Dec 14, 2024 | 55 | Moderate | PM2.5 |
| Dec 13, 2024 | 53 | Moderate | PM2.5 |
| Dec 12, 2024 | 19 | Good | PM2.5 |
| Dec 11, 2024 | 19 | Good | NO2 |
| Dec 10, 2024 | 21 | Good | PM2.5 |
| Dec 9, 2024 | 36 | Good | PM2.5 |
| Dec 8, 2024 | 20 | Good | PM2.5 |
| Dec 7, 2024 | 37 | Good | PM2.5 |
| Dec 6, 2024 | 42 | Good | PM2.5 |
| Dec 5, 2024 | 19 | Good | PM2.5 |
| Dec 4, 2024 | 29 | Good | PM2.5 |
| Dec 3, 2024 | 32 | Good | PM2.5 |
| Dec 2, 2024 | 52 | Moderate | PM2.5 |
| Dec 1, 2024 | 50 | Good | PM2.5 |
| Nov 29, 2024 | 36 | Good | PM2.5 |
| Nov 28, 2024 | 42 | Good | PM2.5 |
| Nov 27, 2024 | 38 | Good | PM2.5 |
| Nov 26, 2024 | 38 | Good | PM2.5 |
| Nov 25, 2024 | 51 | Moderate | PM2.5 |
| Nov 24, 2024 | 32 | Good | PM2.5 |
| Nov 23, 2024 | 38 | Good | PM2.5 |
| Nov 22, 2024 | 17 | Good | PM2.5 |
| Nov 21, 2024 | 8 | Good | PM2.5 |
| Nov 20, 2024 | 26 | Good | NO2 |
| Nov 19, 2024 | 27 | Good | NO2 |
| Nov 18, 2024 | 37 | Good | PM2.5 |
| Nov 17, 2024 | 53 | Moderate | PM2.5 |
| Nov 16, 2024 | 41 | Good | PM2.5 |
| Nov 15, 2024 | 46 | Good | PM2.5 |
| Nov 14, 2024 | 18 | Good | PM2.5 |
| Nov 13, 2024 | 34 | Good | PM2.5 |
| Nov 12, 2024 | 24 | Good | Ozone |
| Nov 11, 2024 | 27 | Good | Ozone |
| Nov 10, 2024 | 31 | Good | Ozone |
| Nov 9, 2024 | 28 | Good | PM2.5 |
| Nov 8, 2024 | 43 | Good | PM2.5 |
| Nov 7, 2024 | 26 | Good | Ozone |
| Nov 6, 2024 | 21 | Good | Ozone |
| Nov 5, 2024 | 31 | Good | Ozone |
| Nov 4, 2024 | 31 | Good | Ozone |
| Nov 3, 2024 | 31 | Good | Ozone |
| Nov 2, 2024 | 38 | Good | Ozone |
| Nov 1, 2024 | 35 | Good | NO2 |
| Oct 31, 2024 | 31 | Good | Ozone |
| Oct 30, 2024 | 55 | Moderate | PM2.5 |
| Oct 29, 2024 | 54 | Moderate | PM2.5 |
| Oct 28, 2024 | 56 | Moderate | PM2.5 |
| Oct 27, 2024 | 39 | Good | Ozone |
| Oct 26, 2024 | 38 | Good | Ozone |
| Oct 25, 2024 | 32 | Good | NO2 |
| Oct 24, 2024 | 37 | Good | Ozone |
| Oct 23, 2024 | 37 | Good | Ozone |
| Oct 22, 2024 | 52 | Moderate | PM2.5 |
| Oct 21, 2024 | 64 | Moderate | Ozone |
| Oct 20, 2024 | 67 | Moderate | PM2.5 |
| Oct 19, 2024 | 63 | Moderate | PM2.5 |
| Oct 18, 2024 | 50 | Good | PM2.5 |
| Oct 17, 2024 | 37 | Good | Ozone |
| Oct 16, 2024 | 33 | Good | NO2 |
| Oct 15, 2024 | 29 | Good | Ozone |
| Oct 14, 2024 | 28 | Good | Ozone |
| Oct 13, 2024 | 41 | Good | Ozone |
| Oct 12, 2024 | 67 | Moderate | Ozone |
| Oct 11, 2024 | 52 | Moderate | PM2.5 |
| Oct 10, 2024 | 54 | Moderate | Ozone |
| Oct 9, 2024 | 47 | Good | Ozone |
| Oct 8, 2024 | 42 | Good | Ozone |
| Oct 7, 2024 | 39 | Good | Ozone |
| Oct 6, 2024 | 39 | Good | Ozone |
| Oct 5, 2024 | 51 | Moderate | Ozone |
| Oct 4, 2024 | 67 | Moderate | Ozone |
| Oct 3, 2024 | 51 | Moderate | Ozone |
| Oct 2, 2024 | 39 | Good | Ozone |
| Oct 1, 2024 | 34 | Good | Ozone |
Monitoring Stations
305 WEIDMAN ROAD (QUEENY)
LACKLAND ROAD
MARICLIFT MON,2.5MILES N OF I-44 ONHWY10
8900 S BROADWAY ST LOUIS MO
8900 SOUTH BROADWAY ST LOUIS MO
2ND ST & ARSENAL ST LOUIS MO
2ND STREET AND ARSENAL ST LOUIS, MO
2ND STREET AND ARSENAL ST LOUIS MO
CLAYTON ANIMAL SHELTER: 77 Hunter Avenue, Ladue, MO 63124
10267 ST CHARLES ROCK ROAD
.7 MILES E FROM OLD SITE ON S SIDE OF ST CHAS ROCK RD.
FORMERLY 5962 SOUTH LINDBERGH.
Ladue
Maryland Heights
Oakville
Pacific
Rider Trail, I-70
Frequently Asked Questions
What is the air quality in Saint Louis, Missouri?
Based on EPA data from 2024, Saint Louis has a median Air Quality Index (AQI) of 43, which is classified as "Good." The primary pollutant is Ozone. Over the past 10 years, air quality has been improving.
Is Saint Louis a good place to live for air quality?
Saint Louis has a 10-year average median AQI of 47. In 2024, there were 266 days with "Good" air quality and 2 days with unhealthy conditions. No special precautions are needed for most people.
What pollutants affect Saint Louis the most?
The primary pollutant driving the AQI in Saint Louis is Ozone. This is monitored by 23 active EPA stations in the county. Other pollutants tracked include ozone, PM10, nitrogen dioxide, sulfur dioxide, and carbon monoxide.
How many air quality monitoring stations are in Saint Louis?
There are 23 active EPA monitoring stations in Saint Louis, Missouri. These stations continuously measure pollutant levels and contribute to the daily AQI calculations.