Defiance, Ohio live air quality index now
Stay updated with real-time air quality in Defiance, Ohio 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)
38
Good
Defiance, Ohio
Last updated: ... (Local time)
Major air pollutants in Defiance, Ohio
Good
Fine
Moderate
Poor
Very poor
Hazardous
Particulate Matter2.5 (PM2.5)
7.08 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
Particulate Matter10 (PM10)
32.36 μg/m³
0
55
155
255
425
605+
Ozone (O3)
11.83 ppb
0
55
71
86
201
201+
Sulfur Dioxide (SO2)
0.59 ppb
0
36
76
186
605
1005+
Nitrogen Dioxide (NO2)
14.30 ppb
0
54
101
361
1250
2050+
Carbon Monoxide (CO)
0.28 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
Low
Defiance, Ohio
Defiance, Ohio
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Defiance, Ohio air quality map: Track AQI near you
Air quality in nearby cities
Van Wert, Ohio
AQI 22
Good
4.14μg/m³
PM2.5
10.69μg/m³
PM10
7.30ppb
O3
1.21ppb
SO2
5.45ppb
NO2
0.31ppm
CO
Auburn, Indiana
AQI 22
Good
4.08μg/m³
PM2.5
17.14μg/m³
PM10
8.28ppb
O3
0.68ppb
SO2
5.88ppb
NO2
0.43ppm
CO
Bowling Green, Ohio
AQI 13
Good
2.20μg/m³
PM2.5
12.22μg/m³
PM10
14.02ppb
O3
0.93ppb
SO2
4.34ppb
NO2
0.14ppm
CO
New Haven, Indiana
AQI 22
Good
3.91μg/m³
PM2.5
17.36μg/m³
PM10
10.63ppb
O3
0.95ppb
SO2
8.41ppb
NO2
0.50ppm
CO
Lima, Ohio
AQI 27
Good
5.17μg/m³
PM2.5
22.88μg/m³
PM10
9.06ppb
O3
1.00ppb
SO2
8.08ppb
NO2
0.20ppm
CO
Findlay, Ohio
AQI 16
Good
2.77μg/m³
PM2.5
9.61μg/m³
PM10
12.04ppb
O3
0.94ppb
SO2
4.38ppb
NO2
0.13ppm
CO
How accurate is Ohio, USA air quality data?
Air quality data and pollutant measurements for Ohio, USA adhere to strict US EPA standards. The data is collected from multiple reliable sources, including satellites and ground-based monitoring stations. This data is further analyzed and enhanced using machine learning and advanced algorithms that factor in elements such as traffic and population density, ensuring accurate and reliable results.
Source: Ambee Data Sources
Frequently asked questions
How often is the air quality data for Defiance, Ohio updated?
The air quality for Defiance, Ohio is updated every hour.
When was the worst air quality at Defiance, Ohio in the last 24 hrs?
The worst air quality in Defiance, Ohio in the last 24 hours was observed at 12:00:00 on 2025-10-24.
When was the best air quality at Defiance, Ohio in the last 24 hrs?
In the last 24 hrs, the best air quality in Defiance, Ohio was observed at 04:00:00 on 2025-10-24.
What is the current air quality in Defiance, Ohio?
The current air quality in Defiance, Ohio is 22, categorized as Good based on real-time data.
What pollutant is the most common in Defiance, Ohio?
The most common pollutant in Defiance, Ohio is PM2.5.
What should I do if the air quality in Defiance, Ohio is poor?
If the air quality in Defiance, Ohio is poor, consider staying indoors and wearing a mask to protect yourself.
What is the current concentration of PM2.5 in Defiance, Ohio?
The current PM2.5 concentration at Defiance, Ohio is 3.907 μg/m3.
What is the current concentration of PM10 in Defiance, Ohio?
The current PM10 concentration at Defiance, Ohio is 12.281 μg/m3.
What is the current concentration of carbon monoxide (CO) in Defiance, Ohio?
The current carbon monoxide (CO) concentration at Defiance, Ohio is 0.14 ppm.
What is the current concentration of sulfur dioxide (SO2) in Defiance, Ohio?
The current sulfur dioxide (SO2) concentration at Defiance, Ohio is 0.483 ppb.
What is the current concentration of ozone (O3) in Defiance, Ohio?
The current ozone (O3) concentration at Defiance, Ohio is 10.065 ppm.
What is the current concentration of nitrogen dioxide (NO2) in Defiance, Ohio?
The current nitrogen dioxide (NO2) concentration at Defiance, Ohio is 5.524 ppb.
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