Air Quality in St. Louis City, Missouri

Q: What is the air quality in St. Louis City, Missouri?

Based on EPA data, St. Louis City has a median AQI of 54 (Moderate). The primary pollutant is PM2.5.

Q: Is St. Louis City a good place to live for air quality?

St. Louis City has a 10-year average median AQI of 54 with 139 good air quality days in 2024.

Median AQI (2024)

156

Max AQI (2024)

→ stable

10-Year Trend

PM2.5

Primary Pollutant

139

Good Days (2024)

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	54	156	139	217	10	69	251
2023	58	172	89	260	16	69	269
2022	55	117	127	233	5	73	259
2021	55	187	114	244	7	50	305
2020	54	156	137	224	5	64	269
2019	54	129	135	225	5	91	264
2018	55	182	129	226	10	75	278
2017	52	115	165	198	2	116	222
2016	53	162	140	223	3	75	276
2015	55	155	122	237	6	20	318

Recent Daily AQI

Date	AQI	Category	Primary Pollutant
Dec 31, 2024	3	Good	CO
Dec 30, 2024	56	Moderate	PM2.5
Dec 29, 2024	51	Moderate	PM2.5
Dec 28, 2024	54	Moderate	PM2.5
Dec 27, 2024	36	Good	PM2.5
Dec 26, 2024	59	Moderate	PM2.5
Dec 25, 2024	64	Moderate	PM2.5
Dec 24, 2024	69	Moderate	PM2.5
Dec 23, 2024	42	Good	PM10
Dec 22, 2024	52	Moderate	PM2.5
Dec 21, 2024	44	Good	PM2.5
Dec 20, 2024	54	Moderate	PM2.5
Dec 19, 2024	52	Moderate	PM2.5
Dec 18, 2024	43	Good	PM2.5
Dec 17, 2024	47	Good	PM2.5
Dec 16, 2024	28	Good	PM2.5
Dec 15, 2024	39	Good	PM2.5
Dec 14, 2024	57	Moderate	PM2.5
Dec 13, 2024	57	Moderate	PM2.5
Dec 12, 2024	34	Good	PM2.5
Dec 11, 2024	31	Good	Ozone
Dec 10, 2024	38	Good	PM2.5
Dec 9, 2024	48	Good	PM2.5
Dec 8, 2024	25	Good	Ozone
Dec 7, 2024	47	Good	PM2.5
Dec 6, 2024	44	Good	PM2.5
Dec 5, 2024	28	Good	PM2.5
Dec 4, 2024	46	Good	PM2.5
Dec 3, 2024	55	Moderate	PM2.5
Dec 2, 2024	49	Good	PM2.5
Dec 1, 2024	47	Good	PM2.5
Nov 30, 2024	5	Good	CO
Nov 29, 2024	40	Good	PM2.5
Nov 28, 2024	52	Moderate	PM2.5
Nov 27, 2024	54	Moderate	PM2.5
Nov 26, 2024	52	Moderate	PM2.5
Nov 25, 2024	55	Moderate	PM2.5
Nov 24, 2024	43	Good	PM2.5
Nov 23, 2024	49	Good	PM2.5
Nov 22, 2024	29	Good	PM2.5
Nov 21, 2024	25	Good	Ozone
Nov 20, 2024	33	Good	Ozone
Nov 19, 2024	33	Good	Ozone
Nov 18, 2024	45	Good	PM2.5
Nov 17, 2024	57	Moderate	PM2.5
Nov 16, 2024	51	Moderate	PM2.5
Nov 15, 2024	58	Moderate	PM2.5
Nov 14, 2024	33	Good	PM2.5
Nov 13, 2024	44	Good	PM2.5
Nov 12, 2024	22	Good	PM2.5
Nov 11, 2024	31	Good	PM2.5
Nov 10, 2024	33	Good	Ozone
Nov 9, 2024	53	Moderate	PM2.5
Nov 8, 2024	54	Moderate	PM2.5
Nov 7, 2024	46	Good	PM2.5
Nov 6, 2024	29	Good	PM2.5
Nov 5, 2024	27	Good	Ozone
Nov 4, 2024	29	Good	PM2.5
Nov 3, 2024	42	Good	PM2.5
Nov 2, 2024	43	Good	PM2.5
Nov 1, 2024	44	Good	PM2.5
Oct 31, 2024	34	Good	PM2.5
Oct 30, 2024	112	Unhealthy for Sensitive Groups	PM10
Oct 29, 2024	131	Unhealthy for Sensitive Groups	PM10
Oct 28, 2024	78	Moderate	PM2.5
Oct 27, 2024	39	Good	PM2.5
Oct 26, 2024	41	Good	PM2.5
Oct 25, 2024	71	Moderate	PM2.5
Oct 24, 2024	66	Moderate	PM10
Oct 23, 2024	58	Moderate	PM2.5
Oct 22, 2024	128	Unhealthy for Sensitive Groups	PM10
Oct 21, 2024	83	Moderate	PM2.5
Oct 20, 2024	84	Moderate	PM2.5
Oct 19, 2024	65	Moderate	PM2.5
Oct 18, 2024	71	Moderate	PM2.5
Oct 17, 2024	73	Moderate	PM10
Oct 16, 2024	48	Good	PM2.5
Oct 15, 2024	63	Moderate	PM10
Oct 14, 2024	44	Good	PM10
Oct 13, 2024	66	Moderate	PM10
Oct 12, 2024	67	Moderate	PM2.5
Oct 11, 2024	87	Moderate	PM10
Oct 10, 2024	76	Moderate	PM10
Oct 9, 2024	85	Moderate	PM10
Oct 8, 2024	56	Moderate	PM2.5
Oct 7, 2024	56	Moderate	PM10
Oct 6, 2024	52	Moderate	PM2.5
Oct 5, 2024	61	Moderate	Ozone
Oct 4, 2024	69	Moderate	PM10
Oct 3, 2024	55	Moderate	PM2.5

Monitoring Stations

1122 CLARK

St. Louis

Est. 1975-01-01

38.6242, -90.1987

11TH & WASHINGTON

St. Louis

Est. 1982-01-01

38.6312, -90.1948

NEWSTEAD & COTEBRILLIANT

St. Louis

Est. 1982-01-01

38.6586, -90.2443

CHAIN OF ROCKS WATER DEPARTMENT

St. Louis

Est. 1984-01-01

38.7512, -90.1882

1009 WASHINGTON

St. Louis

Est. 1985-12-31

38.6312, -90.1943

3026 MINNESOTA AVE

St. Louis

Est. 2001-05-01

38.6018, -90.2329

KEOKUK AND VIRGINIA

St. Louis

Est. 2001-05-01

38.5859, -90.2393

3 NORTH MARKET

St. Louis

Est. 2001-06-01

38.6544, -90.1854

Blair Street

St. Louis

Est. 1999-03-01

38.6564, -90.1983

Branch Street

St. Louis

Est. 2006-10-01

38.6565, -90.1899

CAP SITE

St. Louis

Est. 2001-04-01

38.6168, -90.2082

FORMERLY 29-510-0084 HALL ST & CARRIE

St. Louis

Est. 2001-04-01

38.6908, -90.2093

Forest Park

St. Louis

Est. 2013-01-01

38.6311, -90.2811

HALL ST AND CARRIE WAS 1122 CLARK

St. Louis

Est. 1993-11-01

38.6950, -90.2128

MARGARETTA CATEGORY B CORE SLAM PM2.5.

St. Louis

Est. 1999-01-01

38.6732, -90.2392

SLCI PM25 SITE LOCATED AT 2ND & MOUND STREET.

St. Louis

Est. 1999-11-01

38.6429, -90.1851

South Broadway

St. Louis

Est. 1965-01-01

38.5426, -90.2637

Frequently Asked Questions

What is the air quality in St. Louis City, Missouri?

Based on EPA data from 2024, St. Louis City has a median Air Quality Index (AQI) of 54, which is classified as "Moderate." The primary pollutant is PM2.5. Over the past 10 years, air quality has been stable.

Is St. Louis City a good place to live for air quality?

St. Louis City has a 10-year average median AQI of 54. In 2024, there were 139 days with "Good" air quality and 10 days with unhealthy conditions. Unusually sensitive individuals should consider reducing prolonged outdoor exertion.

What pollutants affect St. Louis City the most?

The primary pollutant driving the AQI in St. Louis City is PM2.5. This is monitored by 17 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 St. Louis City?

There are 17 active EPA monitoring stations in St. Louis City, Missouri. These stations continuously measure pollutant levels and contribute to the daily AQI calculations.