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)
56
Moderate
Defiance, Ohio
Last updated: ... (Local time)
Major air pollutants in Defiance, Ohio
Good
Fine
Moderate
Poor
Very poor
Hazardous
Particulate Matter2.5 (PM2.5)
12.36 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
Particulate Matter10 (PM10)
51.53 μg/m³
0
55
155
255
425
605+
Ozone (O3)
44.18 ppb
0
55
71
86
201
201+
Sulfur Dioxide (SO2)
0.73 ppb
0
36
76
186
605
1005+
Nitrogen Dioxide (NO2)
3.93 ppb
0
54
101
361
1250
2050+
Carbon Monoxide (CO)
0.20 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 56
Moderate
11.94μg/m³
PM2.5
47.81μg/m³
PM10
26.91ppb
O3
1.55ppb
SO2
7.69ppb
NO2
0.20ppm
CO
Auburn, Indiana
AQI 54
Moderate
11.35μg/m³
PM2.5
52.52μg/m³
PM10
26.84ppb
O3
0.75ppb
SO2
8.38ppb
NO2
0.29ppm
CO
Bowling Green, Ohio
AQI 52
Moderate
9.77μg/m³
PM2.5
36.31μg/m³
PM10
25.70ppb
O3
0.56ppb
SO2
5.89ppb
NO2
0.24ppm
CO
New Haven, Indiana
AQI 58
Moderate
12.92μg/m³
PM2.5
58.04μg/m³
PM10
25.13ppb
O3
1.40ppb
SO2
7.81ppb
NO2
0.25ppm
CO
Lima, Ohio
AQI 62
Moderate
15.13μg/m³
PM2.5
68.42μg/m³
PM10
33.86ppb
O3
1.71ppb
SO2
7.92ppb
NO2
0.19ppm
CO
Findlay, Ohio
AQI 52
Moderate
10.46μg/m³
PM2.5
32.43μg/m³
PM10
32.36ppb
O3
0.97ppb
SO2
8.11ppb
NO2
0.23ppm
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 04:00:00 on 2026-08-10.
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 2026-08-09.
What is the current air quality in Defiance, Ohio?
The current air quality in Defiance, Ohio is 56, categorized as Moderate 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 11.6 μg/m3.
What is the current concentration of PM10 in Defiance, Ohio?
The current PM10 concentration at Defiance, Ohio is 49.683 μg/m3.
What is the current concentration of carbon monoxide (CO) in Defiance, Ohio?
The current carbon monoxide (CO) concentration at Defiance, Ohio is 0.188 ppm.
What is the current concentration of sulfur dioxide (SO2) in Defiance, Ohio?
The current sulfur dioxide (SO2) concentration at Defiance, Ohio is 0.655 ppb.
What is the current concentration of ozone (O3) in Defiance, Ohio?
The current ozone (O3) concentration at Defiance, Ohio is 39.252 ppm.
What is the current concentration of nitrogen dioxide (NO2) in Defiance, Ohio?
The current nitrogen dioxide (NO2) concentration at Defiance, Ohio is 3.968 ppb.
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