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
5.21 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
22.87 μg/m³
0
55
155
255
425
605+
21.21 ppb
0
55
71
86
201
201+
0.75 ppb
0
36
76
186
605
1005+
3.04 ppb
0
54
101
361
1250
2050+
0.18 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
Union, Missouri
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AQI 22
Good
4.07μg/m³
PM2.5
18.06μg/m³
PM10
22.35ppb
O3
0.71ppb
SO2
3.14ppb
NO2
0.18ppm
CO
AQI 38
Good
7.40μg/m³
PM2.5
28.07μg/m³
PM10
25.65ppb
O3
0.78ppb
SO2
4.00ppb
NO2
0.19ppm
CO
AQI 38
Good
7.16μg/m³
PM2.5
33.17μg/m³
PM10
24.48ppb
O3
0.79ppb
SO2
4.18ppb
NO2
0.19ppm
CO
AQI 44
Good
7.50μg/m³
PM2.5
28.02μg/m³
PM10
25.75ppb
O3
0.78ppb
SO2
3.69ppb
NO2
0.19ppm
CO
AQI 44
Good
7.53μg/m³
PM2.5
27.95μg/m³
PM10
25.58ppb
O3
0.80ppb
SO2
3.68ppb
NO2
0.19ppm
CO
AQI 38
Good
7.47μg/m³
PM2.5
28.03μg/m³
PM10
25.80ppb
O3
0.77ppb
SO2
3.76ppb
NO2
0.19ppm
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 09:00:00 on 2025-12-07.
In the last 24 hours, the best air quality in Union, Missouri was observed at 04:00:00 on 2025-12-08.
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 5.21 μg/m3.
The PM10 concentration in Union, Missouri is 22.867 μg/m3 at the moment.
The current carbon monoxide (CO) concentration in Union, Missouri is 0.182 ppm.
Currently, Union, Missouri has a sulfur dioxide (SO2) concentration of 0.747 ppb.
The current ozone (O3) level in Union, Missouri at the moment is 21.208 ppm.
Nitrogen dioxide (NO2) level in Union, Missouri at the moment is 3.039 ppb.
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