What is the sulfur dioxide (SO2) level in Waltham, Massachusetts at the moment?

Currently, Waltham, Massachusetts has a sulfur dioxide (SO2) concentration of 0.596 ppb.

What is the ozone (O3) level in Waltham, Massachusetts at the moment?

The current ozone (O3) level in Waltham, Massachusetts at the moment is 34.781 ppm.

What is the nitrogen dioxide (NO2) level in Waltham, Massachusetts at the moment?

Nitrogen dioxide (NO2) level in Waltham, Massachusetts at the moment is 11.992 ppb.

Live air quality index in Waltham, Massachusetts today

Q: What is the PM2.5 level in Waltham, Massachusetts at the moment?

PM2.5 levels in Waltham, Massachusetts are currently 5.126 μg/m3.

Q: What is the PM10 level in Waltham, Massachusetts at the moment?

The PM10 concentration in Waltham, Massachusetts is 21.546 μg/m3 at the moment.

Stay updated with real-time air quality in Waltham, Massachusetts 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

Waltham, Massachusetts

Last updated: ... (Local time)

Major air pollutants in Waltham, Massachusetts

Good

Fine

Moderate

Poor

Very poor

Hazardous

Particulate Matter_2.5 (PM_2.5)

5.13 μg/m³

12.1

35.5

55.5

250.5

500.5+

Particulate Matter₁₀ (PM₁₀)

21.55 μg/m³

155

255

425

605+

Ozone (O₃)

34.78 ppb

201

201+

Sulfur Dioxide (SO₂)

0.60 ppb

186

605

1005+

Nitrogen Dioxide (NO₂)

11.99 ppb

101

361

1250

2050+

Carbon Monoxide (CO)

0.16 ppm

4.5

9.5

12.5

230.5

50.5+

Pollen Level

Moderate

Waltham, Massachusetts

Get Live Pollen Counts

Waltham, Massachusetts

Scroll To Air Quality Map

Track live Waltham, Massachusetts air quality forecast and history

Time	AQI	PM_2.5	PM₁₀	O₃	SO₂	NO₂	CO
2026-05-12T15:00:00.000Z	28 \| good	2.163 \| good	8.013 \| good	29.528 \| good	0.475 \| good	4.255 \| good	0.144 \| good
2026-05-12T16:00:00.000Z	29 \| good	1.964 \| good	7.709 \| good	31.086 \| good	0.474 \| good	4.084 \| good	0.144 \| good
2026-05-12T17:00:00.000Z	31 \| good	1.854 \| good	6.452 \| good	33.101 \| good	0.444 \| good	4.724 \| good	0.13 \| good
2026-05-12T18:00:00.000Z	31 \| good	1.81 \| good	6.342 \| good	34.323 \| good	0.443 \| good	3.695 \| good	0.144 \| good
2026-05-12T19:00:00.000Z	31 \| good	1.685 \| good	6.154 \| good	34.45 \| good	0.442 \| good	3.655 \| good	0.144 \| good
2026-05-12T20:00:00.000Z	32 \| good	1.462 \| good	5.507 \| good	35.45 \| good	0.442 \| good	3.04 \| good	0.144 \| good
2026-05-12T21:00:00.000Z	34 \| good	1.602 \| good	5.781 \| good	36.82 \| good	0.442 \| good	3.02 \| good	0.144 \| good
2026-05-12T22:00:00.000Z	31 \| good	1.532 \| good	6.054 \| good	34.089 \| good	0.442 \| good	3.265 \| good	0.144 \| good
2026-05-12T23:00:00.000Z	35 \| good	1.482 \| good	5.191 \| good	37.652 \| good	0.444 \| good	5.086 \| good	0.144 \| good
2026-05-13T00:00:00.000Z	35 \| good	1.252 \| good	4.445 \| good	37.67 \| good	0.5 \| good	9.352 \| good	0.173 \| good
2026-05-13T01:00:00.000Z	34 \| good	1.542 \| good	5.303 \| good	37.021 \| good	0.495 \| good	10.449 \| good	0.187 \| good
2026-05-13T02:00:00.000Z	31 \| good	2.946 \| good	9.088 \| good	33.872 \| good	0.531 \| good	15.732 \| good	0.187 \| good
2026-05-13T03:00:00.000Z	27 \| good	4.606 \| good	20.085 \| good	19.393 \| good	0.525 \| good	25.587 \| good	0.241 \| good
2026-05-13T04:00:00.000Z	22 \| good	2.281 \| good	9.759 \| good	24.412 \| good	0.458 \| good	9.768 \| good	0.23 \| good
2026-05-13T05:00:00.000Z	21 \| good	2.593 \| good	7.45 \| good	22.654 \| good	0.458 \| good	12.505 \| good	0.217 \| good
2026-05-13T06:00:00.000Z	23 \| good	3.581 \| good	13.472 \| good	25.265 \| good	0.433 \| good	12.894 \| good	0.217 \| good
2026-05-13T07:00:00.000Z	23 \| good	3.993 \| good	15.01 \| good	25.153 \| good	0.41 \| good	14.288 \| good	0.1 \| good
2026-05-13T08:00:00.000Z	26 \| good	4.216 \| good	12.062 \| good	27.923 \| good	0.41 \| good	9.412 \| good	0.144 \| good
2026-05-13T09:00:00.000Z	22 \| good	3.651 \| good	12.257 \| good	23.452 \| good	0.397 \| good	8.557 \| good	0.144 \| good
2026-05-13T10:00:00.000Z	22 \| good	3.607 \| good	14.236 \| good	20.76 \| good	0.473 \| good	7.095 \| good	0.173 \| good
2026-05-13T11:00:00.000Z	21 \| good	3.329 \| good	11.176 \| good	22.986 \| good	0.474 \| good	8.087 \| good	0.216 \| good
2026-05-13T12:00:00.000Z	22 \| good	3.771 \| good	15.784 \| good	20.909 \| good	0.526 \| good	11.065 \| good	0.23 \| good
2026-05-13T13:00:00.000Z	26 \| good	3.748 \| good	14.933 \| good	27.654 \| good	0.526 \| good	11.288 \| good	0.23 \| good
2026-05-13T14:00:00.000Z	26 \| good	4.113 \| good	13.622 \| good	28.377 \| good	0.528 \| good	13.518 \| good	0.217 \| good
2026-05-13T15:00:00.000Z	31 \| good	4.491 \| good	19.654 \| good	34.387 \| good	0.513 \| good	14.035 \| good	0.187 \| good
2026-05-13T16:00:00.000Z	34 \| good	6.22 \| good	27.519 \| good	36.65 \| good	0.347 \| good	3.672 \| good	0.154 \| good
2026-05-13T17:00:00.000Z	31 \| good	5.01 \| good	15.566 \| good	34.227 \| good	0.318 \| good	7.566 \| good	0.217 \| good
2026-05-13T18:00:00.000Z	33 \| good	5.175 \| good	18.368 \| good	36.345 \| good	0.529 \| good	7.979 \| good	0.246 \| good
2026-05-13T19:00:00.000Z	39 \| good	4.753 \| good	20.623 \| good	42.317 \| good	0.529 \| good	7.936 \| good	0.246 \| good
2026-05-13T20:00:00.000Z	42 \| good	5.153 \| good	21.682 \| good	45.392 \| good	0.604 \| good	6.835 \| good	0.173 \| good
2026-05-13T21:00:00.000Z	39 \| good	5.05 \| good	20.261 \| good	42.471 \| good	0.591 \| good	5.751 \| good	0.144 \| good
2026-05-13T22:00:00.000Z	38 \| good	4.868 \| good	21.143 \| good	40.612 \| good	0.604 \| good	7.289 \| good	0.144 \| good
2026-05-13T23:00:00.000Z	46 \| good	4.994 \| good	22.172 \| good	49.942 \| good	0.591 \| good	7.135 \| good	0.187 \| good
2026-05-14T00:00:00.000Z	48 \| good	5.636 \| good	23.552 \| good	51.534 \| good	0.592 \| good	7.283 \| good	0.187 \| good
2026-05-14T01:00:00.000Z	44 \| good	5.611 \| good	23.299 \| good	46.524 \| good	0.509 \| good	5.842 \| good	0.217 \| good
2026-05-14T02:00:00.000Z	41 \| good	5.675 \| good	22.932 \| good	43.744 \| good	0.504 \| good	7.932 \| good	0.217 \| good
2026-05-14T03:00:00.000Z	38 \| good	5.206 \| good	19.982 \| good	41.499 \| good	0.469 \| good	5.758 \| good	0.233 \| good
2026-05-14T04:00:00.000Z	39 \| good	5.341 \| good	19.998 \| good	41.794 \| good	0.47 \| good	5.834 \| good	0.233 \| good
2026-05-14T05:00:00.000Z	41 \| good	5.403 \| good	20.141 \| good	43.896 \| good	0.47 \| good	5.942 \| good	0.173 \| good
2026-05-14T06:00:00.000Z	41 \| good	5.278 \| good	18.156 \| good	44.385 \| good	0.483 \| good	7.205 \| good	0.173 \| good
2026-05-14T07:00:00.000Z	35 \| good	5.184 \| good	19.64 \| good	38.14 \| good	0.483 \| good	7.667 \| good	0.173 \| good
2026-05-14T08:00:00.000Z	40 \| good	4.52 \| good	16.12 \| good	43.266 \| good	0.496 \| good	6.387 \| good	0.193 \| good
2026-05-14T09:00:00.000Z	36 \| good	4.528 \| good	16.383 \| good	39.489 \| good	0.483 \| good	8.837 \| good	0.144 \| good
2026-05-14T10:00:00.000Z	38 \| good	3.995 \| good	15.938 \| good	40.518 \| good	0.509 \| good	11.363 \| good	0.173 \| good
2026-05-14T11:00:00.000Z	36 \| good	4.542 \| good	18.151 \| good	38.597 \| good	0.583 \| good	13.366 \| good	0.158 \| good
2026-05-14T12:00:00.000Z	38 \| good	4.09 \| good	16.399 \| good	40.719 \| good	0.543 \| good	14.219 \| good	0.2 \| good
2026-05-14T13:00:00.000Z	35 \| good	4.081 \| good	14.014 \| good	37.899 \| good	0.543 \| good	14.282 \| good	0.2 \| good
2026-05-14T14:00:00.000Z	37 \| good	4.708 \| good	21.622 \| good	40.074 \| good	0.528 \| good	12.616 \| good	0.157 \| good
2026-05-14T14:00:00.000Z	32 \| good	5.126 \| good	21.546 \| good	34.781 \| good	0.596 \| good	11.992 \| good	0.156 \| good
2026-05-14T15:00:00.000Z	38 \| good	4.181 \| good	18.28 \| good	40.59 \| good	0.246 \| good	4.454 \| good	0.147 \| good
2026-05-14T16:00:00.000Z	39 \| good	3.564 \| good	15.831 \| good	42.368 \| good	0.258 \| good	5.212 \| good	0.15 \| good
2026-05-14T17:00:00.000Z	37 \| good	3.897 \| good	17.218 \| good	40.009 \| good	0.263 \| good	4.204 \| good	0.148 \| good
2026-05-14T18:00:00.000Z	31 \| good	4.444 \| good	19.273 \| good	34.19 \| good	0.269 \| good	4.266 \| good	0.147 \| good
2026-05-14T19:00:00.000Z	33 \| good	5.51 \| good	23.79 \| good	28.996 \| good	0.277 \| good	4.876 \| good	0.151 \| good
2026-05-14T20:00:00.000Z	27 \| good	5.253 \| good	22.808 \| good	25.117 \| good	0.287 \| good	6.505 \| good	0.16 \| good
2026-05-14T21:00:00.000Z	33 \| good	6.114 \| good	27.204 \| good	22.853 \| good	0.277 \| good	7.705 \| good	0.169 \| good
2026-05-14T22:00:00.000Z	33 \| good	6.2 \| good	27.465 \| good	22.488 \| good	0.267 \| good	10.084 \| good	0.187 \| good
2026-05-14T23:00:00.000Z	27 \| good	5.444 \| good	24.032 \| good	24.296 \| good	0.258 \| good	11.037 \| good	0.191 \| good
2026-05-15T00:00:00.000Z	27 \| good	4.895 \| good	21.441 \| good	26.2 \| good	0.27 \| good	13.35 \| good	0.198 \| good
2026-05-15T01:00:00.000Z	28 \| good	4.295 \| good	19.066 \| good	30.44 \| good	0.28 \| good	14.615 \| good	0.199 \| good
2026-05-15T02:00:00.000Z	29 \| good	4.476 \| good	19.654 \| good	31.439 \| good	0.28 \| good	13.721 \| good	0.191 \| good
2026-05-15T03:00:00.000Z	32 \| good	3.047 \| good	12.49 \| good	34.887 \| good	0.268 \| good	11.49 \| good	0.177 \| good
2026-05-15T04:00:00.000Z	31 \| good	3.045 \| good	12.487 \| good	33.326 \| good	0.26 \| good	10.514 \| good	0.171 \| good
2026-05-15T05:00:00.000Z	30 \| good	3.281 \| good	14.302 \| good	31.624 \| good	0.235 \| good	7.696 \| good	0.158 \| good
2026-05-15T06:00:00.000Z	27 \| good	4.252 \| good	18.61 \| good	29.383 \| good	0.217 \| good	5.77 \| good	0.147 \| good
2026-05-15T07:00:00.000Z	27 \| good	4.872 \| good	21.276 \| good	26.186 \| good	0.211 \| good	4.763 \| good	0.14 \| good
2026-05-15T08:00:00.000Z	27 \| good	4.656 \| good	20.422 \| good	26.564 \| good	0.212 \| good	4.257 \| good	0.134 \| good
2026-05-15T09:00:00.000Z	27 \| good	5.472 \| good	23.486 \| good	25.769 \| good	0.215 \| good	3.738 \| good	0.13 \| good
2026-05-15T10:00:00.000Z	24 \| good	3.893 \| good	16.854 \| good	26.064 \| good	0.221 \| good	3.681 \| good	0.128 \| good
2026-05-15T11:00:00.000Z	25 \| good	3.539 \| good	15.727 \| good	27.448 \| good	0.212 \| good	3.776 \| good	0.129 \| good
2026-05-15T12:00:00.000Z	25 \| good	3.333 \| good	14.724 \| good	27.282 \| good	0.188 \| good	4.289 \| good	0.132 \| good
2026-05-15T13:00:00.000Z	27 \| good	3.404 \| good	14.921 \| good	29.294 \| good	0.17 \| good	4.538 \| good	0.136 \| good
2026-05-15T14:00:00.000Z	29 \| good	4.154 \| good	18.395 \| good	31.237 \| good	0.161 \| good	4.074 \| good	0.133 \| good
2026-05-15T15:00:00.000Z	30 \| good	4.886 \| good	20.98 \| good	31.645 \| good	0.155 \| good	3.327 \| good	0.129 \| good
2026-05-15T16:00:00.000Z	33 \| good	5.668 \| good	24.569 \| good	33.418 \| good	0.156 \| good	3.044 \| good	0.128 \| good
2026-05-15T17:00:00.000Z	31 \| good	5.432 \| good	23.009 \| good	34.17 \| good	0.167 \| good	3.009 \| good	0.129 \| good
2026-05-15T18:00:00.000Z	33 \| good	5.535 \| good	23.96 \| good	32.372 \| good	0.187 \| good	3.173 \| good	0.132 \| good
2026-05-15T19:00:00.000Z	33 \| good	6.345 \| good	28.305 \| good	31.566 \| good	0.21 \| good	3.396 \| good	0.134 \| good
2026-05-15T20:00:00.000Z	30 \| good	5.079 \| good	21.921 \| good	32.064 \| good	0.237 \| good	4.191 \| good	0.141 \| good
2026-05-15T21:00:00.000Z	31 \| good	4.721 \| good	20.678 \| good	33.349 \| good	0.262 \| good	6.32 \| good	0.157 \| good
2026-05-15T22:00:00.000Z	34 \| good	2.901 \| good	11.975 \| good	37.043 \| good	0.287 \| good	7.752 \| good	0.171 \| good
2026-05-15T23:00:00.000Z	36 \| good	2.889 \| good	11.92 \| good	38.742 \| good	0.308 \| good	9.648 \| good	0.186 \| good
2026-05-16T00:00:00.000Z	32 \| good	2.729 \| good	11.206 \| good	34.828 \| good	0.31 \| good	12.367 \| good	0.195 \| good
2026-05-16T01:00:00.000Z	31 \| good	2.583 \| good	10.795 \| good	33.382 \| good	0.304 \| good	12.272 \| good	0.186 \| good
2026-05-16T02:00:00.000Z	29 \| good	2.887 \| good	11.933 \| good	31.407 \| good	0.3 \| good	12.16 \| good	0.182 \| good
2026-05-16T03:00:00.000Z	27 \| good	2.906 \| good	12.006 \| good	28.694 \| good	0.293 \| good	12.169 \| good	0.18 \| good
2026-05-16T04:00:00.000Z	26 \| good	2.917 \| good	11.916 \| good	28.103 \| good	0.259 \| good	10.459 \| good	0.174 \| good
2026-05-16T05:00:00.000Z	26 \| good	2.737 \| good	11.055 \| good	27.55 \| good	0.214 \| good	7.863 \| good	0.162 \| good
2026-05-16T06:00:00.000Z	27 \| good	3.117 \| good	3.295 \| good	29.225 \| good	0.181 \| good	6.191 \| good	0.151 \| good
2026-05-16T07:00:00.000Z	24 \| good	1.467 \| good	5.975 \| good	26.203 \| good	0.164 \| good	5.164 \| good	0.144 \| good
2026-05-16T08:00:00.000Z	23 \| good	1.382 \| good	5.189 \| good	24.733 \| good	0.165 \| good	4.61 \| good	0.142 \| good
2026-05-16T09:00:00.000Z	23 \| good	1.83 \| good	7.383 \| good	24.712 \| good	0.177 \| good	4.63 \| good	0.145 \| good
2026-05-16T10:00:00.000Z	25 \| good	1.667 \| good	7.004 \| good	26.986 \| good	0.191 \| good	4.923 \| good	0.149 \| good
2026-05-16T11:00:00.000Z	29 \| good	1.841 \| good	7.383 \| good	30.643 \| good	0.214 \| good	4.887 \| good	0.157 \| good
2026-05-16T12:00:00.000Z	24 \| good	4.095 \| good	4.119 \| good	26.176 \| good	0.251 \| good	4.925 \| good	0.167 \| good
2026-05-16T13:00:00.000Z	31 \| good	4.259 \| good	4.298 \| good	33.152 \| good	0.305 \| good	3.671 \| good	0.164 \| good
2026-05-16T14:00:00.000Z	38 \| good	4.301 \| good	4.382 \| good	40.713 \| good	0.365 \| good	2.508 \| good	0.156 \| good

Waltham

Get reliable air quality data to drive your business

Waltham, Massachusetts air quality map: Stay updated on AQI near you

0.19ppm

How accurate is Massachusetts, USA air quality data?

Air quality and pollutant data for Massachusetts, 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

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Frequently asked questions

How often is air quality information updated for Waltham, Massachusetts?

The air quality information for Waltham, Massachusetts is updated every hour for accuracy.

What time in the last 24 hours was the air quality in Waltham, Massachusetts at its worst?

In the past 24 hours, the air quality in Waltham, Massachusetts was at its worst at 12:00:00 on 2026-05-14.

When did Waltham, Massachusetts experience the best air quality in the last 24 hours?

In the last 24 hours, the best air quality in Waltham, Massachusetts was observed at 02:00:00 on 2026-05-13.

What is the AQI in Waltham, Massachusetts right now?

As of now, the AQI in Waltham, Massachusetts is 32, indicating Good conditions.

What is the most common type of pollution in Waltham, Massachusetts?

Waltham, Massachusetts air has the highest levels of O3.

What should I do in case of poor air quality in Waltham, Massachusetts?

Poor air quality in Waltham, Massachusetts means it's advisable to stay indoors and wear a mask for your protection.

What is the PM_2.5 level in Waltham, Massachusetts at the moment?

PM_2.5 levels in Waltham, Massachusetts are currently 5.126 μg/m³.

What is the PM₁₀ level in Waltham, Massachusetts at the moment?

The PM₁₀ concentration in Waltham, Massachusetts is 21.546 μg/m³ at the moment.

What is the carbon monoxide (CO) level in Waltham, Massachusetts at the moment?

The current carbon monoxide (CO) concentration in Waltham, Massachusetts is 0.156 ppm.

What is the sulfur dioxide (SO₂) level in Waltham, Massachusetts at the moment?

Currently, Waltham, Massachusetts has a sulfur dioxide (SO₂) concentration of 0.596 ppb.

What is the ozone (O₃) level in Waltham, Massachusetts at the moment?

The current ozone (O₃) level in Waltham, Massachusetts at the moment is 34.781 ppm.

What is the nitrogen dioxide (NO₂) level in Waltham, Massachusetts at the moment?

Nitrogen dioxide (NO₂) level in Waltham, Massachusetts at the moment is 11.992 ppb.

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Time	AQI	PM_2.5	PM₁₀	O₃	SO₂	NO₂	CO
2026-05-12T15:00:00.000Z	28 \| good	2.163 \| good	8.013 \| good	29.528 \| good	0.475 \| good	4.255 \| good	0.144 \| good
2026-05-12T16:00:00.000Z	29 \| good	1.964 \| good	7.709 \| good	31.086 \| good	0.474 \| good	4.084 \| good	0.144 \| good
2026-05-12T17:00:00.000Z	31 \| good	1.854 \| good	6.452 \| good	33.101 \| good	0.444 \| good	4.724 \| good	0.13 \| good
2026-05-12T18:00:00.000Z	31 \| good	1.81 \| good	6.342 \| good	34.323 \| good	0.443 \| good	3.695 \| good	0.144 \| good
2026-05-12T19:00:00.000Z	31 \| good	1.685 \| good	6.154 \| good	34.45 \| good	0.442 \| good	3.655 \| good	0.144 \| good
2026-05-12T20:00:00.000Z	32 \| good	1.462 \| good	5.507 \| good	35.45 \| good	0.442 \| good	3.04 \| good	0.144 \| good
2026-05-12T21:00:00.000Z	34 \| good	1.602 \| good	5.781 \| good	36.82 \| good	0.442 \| good	3.02 \| good	0.144 \| good
2026-05-12T22:00:00.000Z	31 \| good	1.532 \| good	6.054 \| good	34.089 \| good	0.442 \| good	3.265 \| good	0.144 \| good
2026-05-12T23:00:00.000Z	35 \| good	1.482 \| good	5.191 \| good	37.652 \| good	0.444 \| good	5.086 \| good	0.144 \| good
2026-05-13T00:00:00.000Z	35 \| good	1.252 \| good	4.445 \| good	37.67 \| good	0.5 \| good	9.352 \| good	0.173 \| good
2026-05-13T01:00:00.000Z	34 \| good	1.542 \| good	5.303 \| good	37.021 \| good	0.495 \| good	10.449 \| good	0.187 \| good
2026-05-13T02:00:00.000Z	31 \| good	2.946 \| good	9.088 \| good	33.872 \| good	0.531 \| good	15.732 \| good	0.187 \| good
2026-05-13T03:00:00.000Z	27 \| good	4.606 \| good	20.085 \| good	19.393 \| good	0.525 \| good	25.587 \| good	0.241 \| good
2026-05-13T04:00:00.000Z	22 \| good	2.281 \| good	9.759 \| good	24.412 \| good	0.458 \| good	9.768 \| good	0.23 \| good
2026-05-13T05:00:00.000Z	21 \| good	2.593 \| good	7.45 \| good	22.654 \| good	0.458 \| good	12.505 \| good	0.217 \| good
2026-05-13T06:00:00.000Z	23 \| good	3.581 \| good	13.472 \| good	25.265 \| good	0.433 \| good	12.894 \| good	0.217 \| good
2026-05-13T07:00:00.000Z	23 \| good	3.993 \| good	15.01 \| good	25.153 \| good	0.41 \| good	14.288 \| good	0.1 \| good
2026-05-13T08:00:00.000Z	26 \| good	4.216 \| good	12.062 \| good	27.923 \| good	0.41 \| good	9.412 \| good	0.144 \| good
2026-05-13T09:00:00.000Z	22 \| good	3.651 \| good	12.257 \| good	23.452 \| good	0.397 \| good	8.557 \| good	0.144 \| good
2026-05-13T10:00:00.000Z	22 \| good	3.607 \| good	14.236 \| good	20.76 \| good	0.473 \| good	7.095 \| good	0.173 \| good
2026-05-13T11:00:00.000Z	21 \| good	3.329 \| good	11.176 \| good	22.986 \| good	0.474 \| good	8.087 \| good	0.216 \| good
2026-05-13T12:00:00.000Z	22 \| good	3.771 \| good	15.784 \| good	20.909 \| good	0.526 \| good	11.065 \| good	0.23 \| good
2026-05-13T13:00:00.000Z	26 \| good	3.748 \| good	14.933 \| good	27.654 \| good	0.526 \| good	11.288 \| good	0.23 \| good
2026-05-13T14:00:00.000Z	26 \| good	4.113 \| good	13.622 \| good	28.377 \| good	0.528 \| good	13.518 \| good	0.217 \| good
2026-05-13T15:00:00.000Z	31 \| good	4.491 \| good	19.654 \| good	34.387 \| good	0.513 \| good	14.035 \| good	0.187 \| good
2026-05-13T16:00:00.000Z	34 \| good	6.22 \| good	27.519 \| good	36.65 \| good	0.347 \| good	3.672 \| good	0.154 \| good
2026-05-13T17:00:00.000Z	31 \| good	5.01 \| good	15.566 \| good	34.227 \| good	0.318 \| good	7.566 \| good	0.217 \| good
2026-05-13T18:00:00.000Z	33 \| good	5.175 \| good	18.368 \| good	36.345 \| good	0.529 \| good	7.979 \| good	0.246 \| good
2026-05-13T19:00:00.000Z	39 \| good	4.753 \| good	20.623 \| good	42.317 \| good	0.529 \| good	7.936 \| good	0.246 \| good
2026-05-13T20:00:00.000Z	42 \| good	5.153 \| good	21.682 \| good	45.392 \| good	0.604 \| good	6.835 \| good	0.173 \| good
2026-05-13T21:00:00.000Z	39 \| good	5.05 \| good	20.261 \| good	42.471 \| good	0.591 \| good	5.751 \| good	0.144 \| good
2026-05-13T22:00:00.000Z	38 \| good	4.868 \| good	21.143 \| good	40.612 \| good	0.604 \| good	7.289 \| good	0.144 \| good
2026-05-13T23:00:00.000Z	46 \| good	4.994 \| good	22.172 \| good	49.942 \| good	0.591 \| good	7.135 \| good	0.187 \| good
2026-05-14T00:00:00.000Z	48 \| good	5.636 \| good	23.552 \| good	51.534 \| good	0.592 \| good	7.283 \| good	0.187 \| good
2026-05-14T01:00:00.000Z	44 \| good	5.611 \| good	23.299 \| good	46.524 \| good	0.509 \| good	5.842 \| good	0.217 \| good
2026-05-14T02:00:00.000Z	41 \| good	5.675 \| good	22.932 \| good	43.744 \| good	0.504 \| good	7.932 \| good	0.217 \| good
2026-05-14T03:00:00.000Z	38 \| good	5.206 \| good	19.982 \| good	41.499 \| good	0.469 \| good	5.758 \| good	0.233 \| good
2026-05-14T04:00:00.000Z	39 \| good	5.341 \| good	19.998 \| good	41.794 \| good	0.47 \| good	5.834 \| good	0.233 \| good
2026-05-14T05:00:00.000Z	41 \| good	5.403 \| good	20.141 \| good	43.896 \| good	0.47 \| good	5.942 \| good	0.173 \| good
2026-05-14T06:00:00.000Z	41 \| good	5.278 \| good	18.156 \| good	44.385 \| good	0.483 \| good	7.205 \| good	0.173 \| good
2026-05-14T07:00:00.000Z	35 \| good	5.184 \| good	19.64 \| good	38.14 \| good	0.483 \| good	7.667 \| good	0.173 \| good
2026-05-14T08:00:00.000Z	40 \| good	4.52 \| good	16.12 \| good	43.266 \| good	0.496 \| good	6.387 \| good	0.193 \| good
2026-05-14T09:00:00.000Z	36 \| good	4.528 \| good	16.383 \| good	39.489 \| good	0.483 \| good	8.837 \| good	0.144 \| good
2026-05-14T10:00:00.000Z	38 \| good	3.995 \| good	15.938 \| good	40.518 \| good	0.509 \| good	11.363 \| good	0.173 \| good
2026-05-14T11:00:00.000Z	36 \| good	4.542 \| good	18.151 \| good	38.597 \| good	0.583 \| good	13.366 \| good	0.158 \| good
2026-05-14T12:00:00.000Z	38 \| good	4.09 \| good	16.399 \| good	40.719 \| good	0.543 \| good	14.219 \| good	0.2 \| good
2026-05-14T13:00:00.000Z	35 \| good	4.081 \| good	14.014 \| good	37.899 \| good	0.543 \| good	14.282 \| good	0.2 \| good
2026-05-14T14:00:00.000Z	37 \| good	4.708 \| good	21.622 \| good	40.074 \| good	0.528 \| good	12.616 \| good	0.157 \| good
2026-05-14T14:00:00.000Z	32 \| good	5.126 \| good	21.546 \| good	34.781 \| good	0.596 \| good	11.992 \| good	0.156 \| good
2026-05-14T15:00:00.000Z	38 \| good	4.181 \| good	18.28 \| good	40.59 \| good	0.246 \| good	4.454 \| good	0.147 \| good
2026-05-14T16:00:00.000Z	39 \| good	3.564 \| good	15.831 \| good	42.368 \| good	0.258 \| good	5.212 \| good	0.15 \| good
2026-05-14T17:00:00.000Z	37 \| good	3.897 \| good	17.218 \| good	40.009 \| good	0.263 \| good	4.204 \| good	0.148 \| good
2026-05-14T18:00:00.000Z	31 \| good	4.444 \| good	19.273 \| good	34.19 \| good	0.269 \| good	4.266 \| good	0.147 \| good
2026-05-14T19:00:00.000Z	33 \| good	5.51 \| good	23.79 \| good	28.996 \| good	0.277 \| good	4.876 \| good	0.151 \| good
2026-05-14T20:00:00.000Z	27 \| good	5.253 \| good	22.808 \| good	25.117 \| good	0.287 \| good	6.505 \| good	0.16 \| good
2026-05-14T21:00:00.000Z	33 \| good	6.114 \| good	27.204 \| good	22.853 \| good	0.277 \| good	7.705 \| good	0.169 \| good
2026-05-14T22:00:00.000Z	33 \| good	6.2 \| good	27.465 \| good	22.488 \| good	0.267 \| good	10.084 \| good	0.187 \| good
2026-05-14T23:00:00.000Z	27 \| good	5.444 \| good	24.032 \| good	24.296 \| good	0.258 \| good	11.037 \| good	0.191 \| good
2026-05-15T00:00:00.000Z	27 \| good	4.895 \| good	21.441 \| good	26.2 \| good	0.27 \| good	13.35 \| good	0.198 \| good
2026-05-15T01:00:00.000Z	28 \| good	4.295 \| good	19.066 \| good	30.44 \| good	0.28 \| good	14.615 \| good	0.199 \| good
2026-05-15T02:00:00.000Z	29 \| good	4.476 \| good	19.654 \| good	31.439 \| good	0.28 \| good	13.721 \| good	0.191 \| good
2026-05-15T03:00:00.000Z	32 \| good	3.047 \| good	12.49 \| good	34.887 \| good	0.268 \| good	11.49 \| good	0.177 \| good
2026-05-15T04:00:00.000Z	31 \| good	3.045 \| good	12.487 \| good	33.326 \| good	0.26 \| good	10.514 \| good	0.171 \| good
2026-05-15T05:00:00.000Z	30 \| good	3.281 \| good	14.302 \| good	31.624 \| good	0.235 \| good	7.696 \| good	0.158 \| good
2026-05-15T06:00:00.000Z	27 \| good	4.252 \| good	18.61 \| good	29.383 \| good	0.217 \| good	5.77 \| good	0.147 \| good
2026-05-15T07:00:00.000Z	27 \| good	4.872 \| good	21.276 \| good	26.186 \| good	0.211 \| good	4.763 \| good	0.14 \| good
2026-05-15T08:00:00.000Z	27 \| good	4.656 \| good	20.422 \| good	26.564 \| good	0.212 \| good	4.257 \| good	0.134 \| good
2026-05-15T09:00:00.000Z	27 \| good	5.472 \| good	23.486 \| good	25.769 \| good	0.215 \| good	3.738 \| good	0.13 \| good
2026-05-15T10:00:00.000Z	24 \| good	3.893 \| good	16.854 \| good	26.064 \| good	0.221 \| good	3.681 \| good	0.128 \| good
2026-05-15T11:00:00.000Z	25 \| good	3.539 \| good	15.727 \| good	27.448 \| good	0.212 \| good	3.776 \| good	0.129 \| good
2026-05-15T12:00:00.000Z	25 \| good	3.333 \| good	14.724 \| good	27.282 \| good	0.188 \| good	4.289 \| good	0.132 \| good
2026-05-15T13:00:00.000Z	27 \| good	3.404 \| good	14.921 \| good	29.294 \| good	0.17 \| good	4.538 \| good	0.136 \| good
2026-05-15T14:00:00.000Z	29 \| good	4.154 \| good	18.395 \| good	31.237 \| good	0.161 \| good	4.074 \| good	0.133 \| good
2026-05-15T15:00:00.000Z	30 \| good	4.886 \| good	20.98 \| good	31.645 \| good	0.155 \| good	3.327 \| good	0.129 \| good
2026-05-15T16:00:00.000Z	33 \| good	5.668 \| good	24.569 \| good	33.418 \| good	0.156 \| good	3.044 \| good	0.128 \| good
2026-05-15T17:00:00.000Z	31 \| good	5.432 \| good	23.009 \| good	34.17 \| good	0.167 \| good	3.009 \| good	0.129 \| good
2026-05-15T18:00:00.000Z	33 \| good	5.535 \| good	23.96 \| good	32.372 \| good	0.187 \| good	3.173 \| good	0.132 \| good
2026-05-15T19:00:00.000Z	33 \| good	6.345 \| good	28.305 \| good	31.566 \| good	0.21 \| good	3.396 \| good	0.134 \| good
2026-05-15T20:00:00.000Z	30 \| good	5.079 \| good	21.921 \| good	32.064 \| good	0.237 \| good	4.191 \| good	0.141 \| good
2026-05-15T21:00:00.000Z	31 \| good	4.721 \| good	20.678 \| good	33.349 \| good	0.262 \| good	6.32 \| good	0.157 \| good
2026-05-15T22:00:00.000Z	34 \| good	2.901 \| good	11.975 \| good	37.043 \| good	0.287 \| good	7.752 \| good	0.171 \| good
2026-05-15T23:00:00.000Z	36 \| good	2.889 \| good	11.92 \| good	38.742 \| good	0.308 \| good	9.648 \| good	0.186 \| good
2026-05-16T00:00:00.000Z	32 \| good	2.729 \| good	11.206 \| good	34.828 \| good	0.31 \| good	12.367 \| good	0.195 \| good
2026-05-16T01:00:00.000Z	31 \| good	2.583 \| good	10.795 \| good	33.382 \| good	0.304 \| good	12.272 \| good	0.186 \| good
2026-05-16T02:00:00.000Z	29 \| good	2.887 \| good	11.933 \| good	31.407 \| good	0.3 \| good	12.16 \| good	0.182 \| good
2026-05-16T03:00:00.000Z	27 \| good	2.906 \| good	12.006 \| good	28.694 \| good	0.293 \| good	12.169 \| good	0.18 \| good
2026-05-16T04:00:00.000Z	26 \| good	2.917 \| good	11.916 \| good	28.103 \| good	0.259 \| good	10.459 \| good	0.174 \| good
2026-05-16T05:00:00.000Z	26 \| good	2.737 \| good	11.055 \| good	27.55 \| good	0.214 \| good	7.863 \| good	0.162 \| good
2026-05-16T06:00:00.000Z	27 \| good	3.117 \| good	3.295 \| good	29.225 \| good	0.181 \| good	6.191 \| good	0.151 \| good
2026-05-16T07:00:00.000Z	24 \| good	1.467 \| good	5.975 \| good	26.203 \| good	0.164 \| good	5.164 \| good	0.144 \| good
2026-05-16T08:00:00.000Z	23 \| good	1.382 \| good	5.189 \| good	24.733 \| good	0.165 \| good	4.61 \| good	0.142 \| good
2026-05-16T09:00:00.000Z	23 \| good	1.83 \| good	7.383 \| good	24.712 \| good	0.177 \| good	4.63 \| good	0.145 \| good
2026-05-16T10:00:00.000Z	25 \| good	1.667 \| good	7.004 \| good	26.986 \| good	0.191 \| good	4.923 \| good	0.149 \| good
2026-05-16T11:00:00.000Z	29 \| good	1.841 \| good	7.383 \| good	30.643 \| good	0.214 \| good	4.887 \| good	0.157 \| good
2026-05-16T12:00:00.000Z	24 \| good	4.095 \| good	4.119 \| good	26.176 \| good	0.251 \| good	4.925 \| good	0.167 \| good
2026-05-16T13:00:00.000Z	31 \| good	4.259 \| good	4.298 \| good	33.152 \| good	0.305 \| good	3.671 \| good	0.164 \| good
2026-05-16T14:00:00.000Z	38 \| good	4.301 \| good	4.382 \| good	40.713 \| good	0.365 \| good	2.508 \| good	0.156 \| good

Live air quality index in Waltham, Massachusetts today

Major air pollutants in Waltham, Massachusetts

Particulate Matter2.5 (PM2.5)

Particulate Matter10 (PM10)

Ozone (O3)

Sulfur Dioxide (SO2)

Nitrogen Dioxide (NO2)

Carbon Monoxide (CO)

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Wellesley, Massachusetts

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What is the PM2.5 level in Waltham, Massachusetts at the moment?

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What is the ozone (O3) level in Waltham, Massachusetts at the moment?

What is the nitrogen dioxide (NO2) level in Waltham, Massachusetts at the moment?

Particulate Matter_2.5 (PM_2.5)

Particulate Matter₁₀ (PM₁₀)

Ozone (O₃)

Sulfur Dioxide (SO₂)

Nitrogen Dioxide (NO₂)

What is the PM_2.5 level in Waltham, Massachusetts at the moment?

What is the PM₁₀ level in Waltham, Massachusetts at the moment?

What is the sulfur dioxide (SO₂) level in Waltham, Massachusetts at the moment?

What is the ozone (O₃) level in Waltham, Massachusetts at the moment?

What is the nitrogen dioxide (NO₂) level in Waltham, Massachusetts at the moment?