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)
27
Good
Union, Missouri
Last updated: ... (Local time)

Good
Fine
Moderate
Poor
Very poor
Hazardous
5.47 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
21.62 μg/m³
0
55
155
255
425
605+
23.90 ppb
0
55
71
86
201
201+
0.72 ppb
0
36
76
186
605
1005+
4.51 ppb
0
54
101
361
1250
2050+
0.27 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
Union, Missouri
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AQI 33
Good
5.65μg/m³
PM2.5
19.46μg/m³
PM10
20.41ppb
O3
0.71ppb
SO2
4.52ppb
NO2
0.27ppm
CO
AQI 27
Good
5.06μg/m³
PM2.5
24.47μg/m³
PM10
29.07ppb
O3
0.64ppb
SO2
8.21ppb
NO2
0.27ppm
CO
AQI 28
Good
4.98μg/m³
PM2.5
23.42μg/m³
PM10
29.50ppb
O3
0.66ppb
SO2
7.79ppb
NO2
0.27ppm
CO
AQI 33
Good
5.66μg/m³
PM2.5
20.49μg/m³
PM10
24.18ppb
O3
0.63ppb
SO2
7.72ppb
NO2
0.27ppm
CO
AQI 33
Good
5.62μg/m³
PM2.5
20.45μg/m³
PM10
23.68ppb
O3
0.64ppb
SO2
7.72ppb
NO2
0.27ppm
CO
AQI 33
Good
5.66μg/m³
PM2.5
20.50μg/m³
PM10
23.64ppb
O3
0.62ppb
SO2
7.69ppb
NO2
0.27ppm
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 07:00:00 on 2026-06-07.
In the last 24 hours, the best air quality in Union, Missouri was observed at 11:00:00 on 2026-06-08.
As of now, the AQI in Union, Missouri is 27, indicating Good conditions.
Union, Missouri air has the highest levels of PM2.5.
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 5.471 μg/m3.
The PM10 concentration in Union, Missouri is 21.622 μg/m3 at the moment.
The current carbon monoxide (CO) concentration in Union, Missouri is 0.272 ppm.
Currently, Union, Missouri has a sulfur dioxide (SO2) concentration of 0.722 ppb.
The current ozone (O3) level in Union, Missouri at the moment is 23.9 ppm.
Nitrogen dioxide (NO2) level in Union, Missouri at the moment is 4.51 ppb.
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