What is the current concentration of PM10 in Defiance, Ohio?

The current PM10 concentration at Defiance, Ohio is 29.643 μg/m3.

What is the current concentration of sulfur dioxide (SO2) in Defiance, Ohio?

The current sulfur dioxide (SO2) concentration at Defiance, Ohio is 1.16 ppb.

What is the current concentration of ozone (O3) in Defiance, Ohio?

The current ozone (O3) concentration at Defiance, Ohio is 37.822 ppm.

What is the current concentration of nitrogen dioxide (NO2) in Defiance, Ohio?

The current nitrogen dioxide (NO2) concentration at Defiance, Ohio is 2.819 ppb.

Defiance, Ohio live air quality index now

Q: What is the current concentration of PM2.5 in Defiance, Ohio?

The current PM2.5 concentration at Defiance, Ohio is 7.201 μg/m3.

Stay updated with real-time air quality in Defiance, Ohio featuring accurate data on AQI, PM_2.5, 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)

Good

Defiance, Ohio

Last updated: ... (Local time)

Major air pollutants in Defiance, Ohio

Good

Fine

Moderate

Poor

Very poor

Hazardous

Particulate Matter_2.5 (PM_2.5)

7.20 μg/m³

12.1

35.5

55.5

250.5

500.5+

Particulate Matter₁₀ (PM₁₀)

29.64 μg/m³

155

255

425

605+

Ozone (O₃)

37.82 ppb

201

201+

Sulfur Dioxide (SO₂)

1.16 ppb

186

605

1005+

Nitrogen Dioxide (NO₂)

2.82 ppb

101

361

1250

2050+

Carbon Monoxide (CO)

0.16 ppm

4.5

9.5

12.5

230.5

50.5+

Pollen Level

Looks like we don't have this data available right now

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Defiance, Ohio

Scroll To Air Quality Map

Track live Defiance, Ohio air quality forecast and history

Time	AQI	PM_2.5	PM₁₀	O₃	SO₂	NO₂	CO
2026-03-07T21:00:00.000Z	32 \| good	2.521 \| good	9.459 \| good	35.455 \| good	0.627 \| good	2.87 \| good	0.131 \| good
2026-03-07T22:00:00.000Z	35 \| good	1.885 \| good	7.56 \| good	37.656 \| good	0.708 \| good	3.35 \| good	0.135 \| good
2026-03-07T23:00:00.000Z	32 \| good	4.485 \| good	18.854 \| good	35.178 \| good	0.942 \| good	2.929 \| good	0.144 \| good
2026-03-08T00:00:00.000Z	31 \| good	4.868 \| good	20.599 \| good	34.314 \| good	0.893 \| good	3.179 \| good	0.139 \| good
2026-03-08T01:00:00.000Z	33 \| good	5.717 \| good	25.694 \| good	30.469 \| good	0.857 \| good	3.549 \| good	0.16 \| good
2026-03-08T02:00:00.000Z	38 \| good	6.784 \| good	29.106 \| good	28.728 \| good	0.931 \| good	3.673 \| good	0.172 \| good
2026-03-08T03:00:00.000Z	49 \| good	9.16 \| good	41.042 \| good	27.941 \| good	0.728 \| good	3.357 \| good	0.198 \| good
2026-03-08T04:00:00.000Z	38 \| good	6.772 \| good	28.434 \| good	24.865 \| good	0.887 \| good	4.074 \| good	0.183 \| good
2026-03-08T05:00:00.000Z	33 \| good	6.065 \| good	26.02 \| good	24.067 \| good	0.845 \| good	3.712 \| good	0.186 \| good
2026-03-08T06:00:00.000Z	33 \| good	6.185 \| good	26.396 \| good	25.617 \| good	0.675 \| good	3.748 \| good	0.188 \| good
2026-03-08T07:00:00.000Z	38 \| good	6.52 \| good	28.896 \| good	25.804 \| good	0.705 \| good	3.457 \| good	0.184 \| good
2026-03-08T08:00:00.000Z	33 \| good	6.142 \| good	27.693 \| good	25.6 \| good	0.716 \| good	3.343 \| good	0.186 \| good
2026-03-08T09:00:00.000Z	38 \| good	6.673 \| good	30.248 \| good	25.249 \| good	0.739 \| good	3.87 \| good	0.192 \| good
2026-03-08T10:00:00.000Z	44 \| good	8.399 \| good	34.466 \| good	23.926 \| good	0.85 \| good	3.892 \| good	0.192 \| good
2026-03-08T11:00:00.000Z	52 \| moderate	9.855 \| good	44.159 \| good	24.753 \| good	0.88 \| good	2.609 \| good	0.186 \| good
2026-03-08T12:00:00.000Z	56 \| moderate	11.646 \| good	45.748 \| good	23.799 \| good	0.887 \| good	2.496 \| good	0.185 \| good
2026-03-08T13:00:00.000Z	54 \| moderate	10.999 \| good	48.101 \| good	24.482 \| good	0.754 \| good	2.461 \| good	0.163 \| good
2026-03-08T14:00:00.000Z	38 \| good	7.365 \| good	29.106 \| good	27.581 \| good	0.932 \| good	2.599 \| good	0.164 \| good
2026-03-08T15:00:00.000Z	38 \| good	7.322 \| good	30.736 \| good	29.815 \| good	0.821 \| good	1.992 \| good	0.173 \| good
2026-03-08T16:00:00.000Z	29 \| good	5.275 \| good	23.374 \| good	30.943 \| good	0.737 \| good	1.624 \| good	0.174 \| good
2026-03-08T17:00:00.000Z	31 \| good	4.978 \| good	20.733 \| good	33.807 \| good	0.809 \| good	1.716 \| good	0.166 \| good
2026-03-08T18:00:00.000Z	32 \| good	5.297 \| good	19.715 \| good	35.306 \| good	0.771 \| good	1.412 \| good	0.163 \| good
2026-03-08T19:00:00.000Z	33 \| good	5.043 \| good	17.441 \| good	36.248 \| good	0.67 \| good	1.536 \| good	0.159 \| good
2026-03-08T20:00:00.000Z	33 \| good	4.595 \| good	19.843 \| good	36.389 \| good	0.587 \| good	1.598 \| good	0.164 \| good
2026-03-08T21:00:00.000Z	35 \| good	3.781 \| good	14.989 \| good	38.033 \| good	0.658 \| good	1.666 \| good	0.155 \| good
2026-03-08T22:00:00.000Z	36 \| good	2.338 \| good	8.34 \| good	38.723 \| good	0.746 \| good	1.501 \| good	0.163 \| good
2026-03-08T23:00:00.000Z	35 \| good	2.069 \| good	8.635 \| good	37.939 \| good	0.74 \| good	1.967 \| good	0.168 \| good
2026-03-09T00:00:00.000Z	33 \| good	2.404 \| good	9.886 \| good	35.721 \| good	0.687 \| good	2.413 \| good	0.176 \| good
2026-03-09T01:00:00.000Z	31 \| good	3.048 \| good	12.106 \| good	33.212 \| good	1.023 \| good	3 \| good	0.188 \| good
2026-03-09T02:00:00.000Z	29 \| good	3.328 \| good	14.52 \| good	30.712 \| good	0.8 \| good	3.212 \| good	0.196 \| good
2026-03-09T03:00:00.000Z	27 \| good	3.717 \| good	16.478 \| good	29.009 \| good	0.69 \| good	2.529 \| good	0.177 \| good
2026-03-09T04:00:00.000Z	28 \| good	3.399 \| good	15.234 \| good	30.034 \| good	1.49 \| good	2.722 \| good	0.209 \| good
2026-03-09T05:00:00.000Z	28 \| good	3.248 \| good	14.39 \| good	29.882 \| good	2.012 \| good	2.556 \| good	0.211 \| good
2026-03-09T06:00:00.000Z	27 \| good	3.44 \| good	14.434 \| good	28.815 \| good	2.247 \| good	3.175 \| good	0.184 \| good
2026-03-09T07:00:00.000Z	27 \| good	4.008 \| good	18.182 \| good	28.589 \| good	2.496 \| good	3.196 \| good	0.175 \| good
2026-03-09T08:00:00.000Z	27 \| good	4.109 \| good	19.493 \| good	28.671 \| good	2.667 \| good	2.835 \| good	0.169 \| good
2026-03-09T09:00:00.000Z	28 \| good	4.431 \| good	21.089 \| good	29.519 \| good	2.992 \| good	2.824 \| good	0.168 \| good
2026-03-09T10:00:00.000Z	27 \| good	4.512 \| good	19.147 \| good	29.356 \| good	2.851 \| good	3.639 \| good	0.186 \| good
2026-03-09T11:00:00.000Z	27 \| good	4.64 \| good	20.711 \| good	27.476 \| good	3.061 \| good	5.079 \| good	0.2 \| good
2026-03-09T12:00:00.000Z	27 \| good	4.814 \| good	20.991 \| good	26.11 \| good	2.88 \| good	5.75 \| good	0.22 \| good
2026-03-09T13:00:00.000Z	33 \| good	5.53 \| good	24.831 \| good	25.762 \| good	2.545 \| good	5.468 \| good	0.23 \| good
2026-03-09T14:00:00.000Z	33 \| good	5.619 \| good	24.457 \| good	25.064 \| good	2.379 \| good	4.845 \| good	0.191 \| good
2026-03-09T15:00:00.000Z	33 \| good	6.184 \| good	25.72 \| good	27.199 \| good	1.843 \| good	4.799 \| good	0.184 \| good
2026-03-09T16:00:00.000Z	33 \| good	5.85 \| good	22.834 \| good	29.163 \| good	1.692 \| good	3.968 \| good	0.174 \| good
2026-03-09T17:00:00.000Z	33 \| good	5.601 \| good	23.807 \| good	32.634 \| good	1.504 \| good	3.395 \| good	0.164 \| good
2026-03-09T18:00:00.000Z	38 \| good	7.29 \| good	30.907 \| good	36.797 \| good	1.319 \| good	3.289 \| good	0.159 \| good
2026-03-09T19:00:00.000Z	38 \| good	7.201 \| good	29.643 \| good	37.822 \| good	1.16 \| good	2.819 \| good	0.158 \| good
2026-03-09T20:00:00.000Z	44 \| good	7.513 \| good	29.593 \| good	39.903 \| good	1.165 \| good	2.874 \| good	0.158 \| good
2026-03-09T20:00:00.000Z	38 \| good	7.201 \| good	29.643 \| good	37.822 \| good	1.16 \| good	2.819 \| good	0.158 \| good
2026-03-09T21:00:00.000Z	42 \| good	7.413 \| good	32.696 \| good	44.589 \| good	1.073 \| good	0.835 \| good	0.155 \| good
2026-03-09T22:00:00.000Z	40 \| good	5.989 \| good	26.867 \| good	43.019 \| good	1.135 \| good	1.346 \| good	0.158 \| good
2026-03-09T23:00:00.000Z	37 \| good	5.426 \| good	23 \| good	39.732 \| good	1.197 \| good	1.856 \| good	0.161 \| good
2026-03-10T00:00:00.000Z	31 \| good	5.316 \| good	22.934 \| good	32.921 \| good	1.258 \| good	2.367 \| good	0.164 \| good
2026-03-10T01:00:00.000Z	33 \| good	5.571 \| good	23.899 \| good	31.174 \| good	1.265 \| good	2.596 \| good	0.165 \| good
2026-03-10T02:00:00.000Z	38 \| good	7.196 \| good	31.844 \| good	27.729 \| good	1.271 \| good	2.826 \| good	0.167 \| good
2026-03-10T03:00:00.000Z	44 \| good	7.594 \| good	33.5 \| good	27.247 \| good	1.278 \| good	3.055 \| good	0.168 \| good
2026-03-10T04:00:00.000Z	33 \| good	6.155 \| good	27.362 \| good	28.412 \| good	1.241 \| good	2.995 \| good	0.164 \| good
2026-03-10T05:00:00.000Z	33 \| good	5.557 \| good	23.949 \| good	27.821 \| good	1.204 \| good	2.936 \| good	0.161 \| good
2026-03-10T06:00:00.000Z	27 \| good	5.028 \| good	21.699 \| good	26.677 \| good	1.167 \| good	2.877 \| good	0.157 \| good
2026-03-10T07:00:00.000Z	26 \| good	2.904 \| good	12 \| good	28.256 \| good	1.31 \| good	2.666 \| good	0.151 \| good
2026-03-10T08:00:00.000Z	28 \| good	1.954 \| good	8 \| good	30.379 \| good	1.453 \| good	2.456 \| good	0.145 \| good
2026-03-10T09:00:00.000Z	29 \| good	2.033 \| good	8.088 \| good	31.044 \| good	1.597 \| good	2.245 \| good	0.139 \| good
2026-03-10T10:00:00.000Z	33 \| good	5.958 \| good	26.316 \| good	24.12 \| good	1.469 \| good	2.127 \| good	0.135 \| good
2026-03-10T11:00:00.000Z	33 \| good	5.518 \| good	23.692 \| good	22.65 \| good	1.342 \| good	2.009 \| good	0.131 \| good
2026-03-10T12:00:00.000Z	27 \| good	5.361 \| good	23.014 \| good	21.068 \| good	1.214 \| good	1.891 \| good	0.128 \| good
2026-03-10T13:00:00.000Z	33 \| good	5.602 \| good	23.924 \| good	20.794 \| good	1.099 \| good	1.952 \| good	0.129 \| good
2026-03-10T14:00:00.000Z	33 \| good	6.229 \| good	27.733 \| good	24.011 \| good	0.984 \| good	2.014 \| good	0.129 \| good
2026-03-10T15:00:00.000Z	27 \| good	4.852 \| good	20.967 \| good	26.939 \| good	0.868 \| good	2.075 \| good	0.13 \| good
2026-03-10T16:00:00.000Z	27 \| good	5.149 \| good	22 \| good	27.409 \| good	0.731 \| good	1.711 \| good	0.128 \| good
2026-03-10T17:00:00.000Z	27 \| good	4.599 \| good	19.967 \| good	28.969 \| good	0.594 \| good	1.347 \| good	0.126 \| good
2026-03-10T18:00:00.000Z	38 \| good	7.053 \| good	31.253 \| good	25.731 \| good	0.457 \| good	0.983 \| good	0.124 \| good
2026-03-10T19:00:00.000Z	38 \| good	7.235 \| good	31.899 \| good	25.317 \| good	0.407 \| good	0.886 \| good	0.123 \| good
2026-03-10T20:00:00.000Z	38 \| good	7.356 \| good	32.445 \| good	25.032 \| good	0.358 \| good	0.79 \| good	0.122 \| good
2026-03-10T21:00:00.000Z	38 \| good	6.926 \| good	30.659 \| good	25.755 \| good	0.308 \| good	0.693 \| good	0.121 \| good
2026-03-10T22:00:00.000Z	33 \| good	6.318 \| good	28.021 \| good	28.145 \| good	0.343 \| good	1.297 \| good	0.126 \| good
2026-03-10T23:00:00.000Z	38 \| good	6.505 \| good	28.858 \| good	29.464 \| good	0.378 \| good	1.902 \| good	0.131 \| good
2026-03-11T00:00:00.000Z	34 \| good	4.256 \| good	18.879 \| good	36.907 \| good	0.413 \| good	2.507 \| good	0.136 \| good
2026-03-11T01:00:00.000Z	31 \| good	3.633 \| good	15.931 \| good	34.103 \| good	0.528 \| good	2.484 \| good	0.135 \| good
2026-03-11T02:00:00.000Z	52 \| moderate	10.193 \| good	45.34 \| good	25.631 \| good	0.643 \| good	2.462 \| good	0.134 \| good
2026-03-11T03:00:00.000Z	54 \| moderate	11.334 \| good	50.131 \| good	25.355 \| good	0.757 \| good	2.439 \| good	0.133 \| good
2026-03-11T04:00:00.000Z	54 \| moderate	10.558 \| good	46.79 \| good	27.849 \| good	0.842 \| good	2.258 \| good	0.13 \| good
2026-03-11T05:00:00.000Z	52 \| moderate	9.502 \| good	41.851 \| good	29.054 \| good	0.927 \| good	2.077 \| good	0.127 \| good
2026-03-11T06:00:00.000Z	44 \| good	8.391 \| good	8.604 \| good	34.162 \| good	1.009 \| good	1.887 \| good	0.123 \| good
2026-03-11T07:00:00.000Z	27 \| good	4.948 \| good	21.619 \| good	29.388 \| good	1.069 \| good	1.781 \| good	0.12 \| good
2026-03-11T08:00:00.000Z	23 \| good	1.112 \| good	4.587 \| good	24.634 \| good	1.127 \| good	1.666 \| good	0.116 \| good
2026-03-11T09:00:00.000Z	23 \| good	0.758 \| good	2.967 \| good	24.943 \| good	1.185 \| good	1.55 \| good	0.113 \| good
2026-03-11T10:00:00.000Z	23 \| good	2.865 \| good	11.924 \| good	25.048 \| good	0.989 \| good	1.521 \| good	0.112 \| good
2026-03-11T11:00:00.000Z	24 \| good	3.007 \| good	12.467 \| good	26.406 \| good	0.793 \| good	1.491 \| good	0.11 \| good
2026-03-11T12:00:00.000Z	27 \| good	5.217 \| good	5.313 \| good	29.427 \| good	0.599 \| good	1.463 \| good	0.109 \| good
2026-03-11T13:00:00.000Z	33 \| good	5.579 \| good	5.723 \| good	30.439 \| good	0.472 \| good	1.494 \| good	0.11 \| good
2026-03-11T14:00:00.000Z	29 \| good	3.977 \| good	4.079 \| good	31.451 \| good	0.345 \| good	1.525 \| good	0.112 \| good
2026-03-11T15:00:00.000Z	30 \| good	2.166 \| good	2.22 \| good	32.464 \| good	0.217 \| good	1.556 \| good	0.114 \| good
2026-03-11T16:00:00.000Z	29 \| good	1.493 \| good	1.517 \| good	31.462 \| good	0.286 \| good	1.618 \| good	0.116 \| good
2026-03-11T17:00:00.000Z	27 \| good	1.083 \| good	4.308 \| good	29.409 \| good	0.352 \| good	1.685 \| good	0.118 \| good
2026-03-11T18:00:00.000Z	27 \| good	1.026 \| good	1.03 \| good	29.459 \| good	0.424 \| good	1.741 \| good	0.12 \| good
2026-03-11T19:00:00.000Z	25 \| good	0.919 \| good	0.921 \| good	27.171 \| good	0.381 \| good	2.272 \| good	0.139 \| good
2026-03-11T20:00:00.000Z	23 \| good	0.621 \| good	0.629 \| good	24.883 \| good	0.338 \| good	2.804 \| good	0.158 \| good

Defiance

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Defiance, Ohio air quality map: Track AQI near you

0.17ppm

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

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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 07:00:00 on 2026-03-09.

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 12:00:00 on 2026-03-09.

What is the current air quality in Defiance, Ohio?

The current air quality in Defiance, Ohio is 38, 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 PM_2.5 in Defiance, Ohio?

The current PM_2.5 concentration at Defiance, Ohio is 7.201 μg/m³.

What is the current concentration of PM₁₀ in Defiance, Ohio?

The current PM₁₀ concentration at Defiance, Ohio is 29.643 μg/m³.

What is the current concentration of carbon monoxide (CO) in Defiance, Ohio?

The current carbon monoxide (CO) concentration at Defiance, Ohio is 0.158 ppm.

What is the current concentration of sulfur dioxide (SO₂) in Defiance, Ohio?

The current sulfur dioxide (SO₂) concentration at Defiance, Ohio is 1.16 ppb.

What is the current concentration of ozone (O₃) in Defiance, Ohio?

The current ozone (O₃) concentration at Defiance, Ohio is 37.822 ppm.

What is the current concentration of nitrogen dioxide (NO₂) in Defiance, Ohio?

The current nitrogen dioxide (NO₂) concentration at Defiance, Ohio is 2.819 ppb.

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