Stay updated with real-time air quality in Union, Missouri featuring accurate data on AQI, PM2.5, PM10, O3, NO2, SO2, and CO levels. Use our interactive map and detailed forecasts to monitor pollution trends, manage health risks, and plan your daily activities with confidence.
Live AQI (Air Quality Index)
39
Good
Union, Missouri
Last updated: ... (Local time)

Good
Fine
Moderate
Poor
Very poor
Hazardous
6.54 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
29.07 μg/m³
0
55
155
255
425
605+
41.94 ppb
0
55
71
86
201
201+
0.70 ppb
0
36
76
186
605
1005+
2.98 ppb
0
54
101
361
1250
2050+
0.23 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
Union, Missouri
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AQI 44
Good
5.04μg/m³
PM2.5
30.94μg/m³
PM10
46.64ppb
O3
0.69ppb
SO2
2.98ppb
NO2
0.23ppm
CO
AQI 46
Good
5.16μg/m³
PM2.5
20.98μg/m³
PM10
50.30ppb
O3
0.62ppb
SO2
2.71ppb
NO2
0.21ppm
CO
AQI 47
Good
5.10μg/m³
PM2.5
20.96μg/m³
PM10
51.39ppb
O3
0.65ppb
SO2
2.75ppb
NO2
0.21ppm
CO
AQI 41
Good
5.95μg/m³
PM2.5
23.69μg/m³
PM10
43.50ppb
O3
0.69ppb
SO2
2.98ppb
NO2
0.22ppm
CO
AQI 40
Good
5.95μg/m³
PM2.5
21.92μg/m³
PM10
43.20ppb
O3
0.69ppb
SO2
2.97ppb
NO2
0.22ppm
CO
AQI 41
Good
5.89μg/m³
PM2.5
24.41μg/m³
PM10
43.56ppb
O3
0.65ppb
SO2
2.99ppb
NO2
0.22ppm
CO
Air quality and pollutant data for Missouri, USA are sourced from ground-based monitors and satellites, adhering to US EPA standards. Machine learning and advanced algorithms enhance the data by incorporating local variables like traffic and population density, ensuring high accuracy and dependability.
Source: Ambee Data Sources
The air quality information for Union, Missouri is updated every hour for accuracy.
In the past 24 hours, the air quality in Union, Missouri was at its worst at 01:00:00 on 2026-07-23.
In the last 24 hours, the best air quality in Union, Missouri was observed at 12:00:00 on 2026-07-23.
As of now, the AQI in Union, Missouri is 39, indicating Good conditions.
Union, Missouri air has the highest levels of O3.
Poor air quality in Union, Missouri means it's advisable to stay indoors and wear a mask for your protection.
PM2.5 levels in Union, Missouri are currently 6.537 μg/m3.
The PM10 concentration in Union, Missouri is 29.072 μg/m3 at the moment.
The current carbon monoxide (CO) concentration in Union, Missouri is 0.225 ppm.
Currently, Union, Missouri has a sulfur dioxide (SO2) concentration of 0.703 ppb.
The current ozone (O3) level in Union, Missouri at the moment is 41.941 ppm.
Nitrogen dioxide (NO2) level in Union, Missouri at the moment is 2.977 ppb.
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