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

Currently, Waltham, Massachusetts has a sulfur dioxide (SO2) concentration of 0.645 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 29.201 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 9.105 ppb.

Real-time air quality index in Waltham, Massachusetts today

Name: Live air pollution levels in Waltham, Massachusetts today
Creator: Ambee

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)

9.24 μg/m³

12.1

35.5

55.5

250.5

500.5+

Particulate Matter₁₀ (PM₁₀)

23.93 μg/m³

155

255

425

605+

Ozone (O₃)

29.20 ppb

201

201+

Sulfur Dioxide (SO₂)

0.65 ppb

186

605

1005+

Nitrogen Dioxide (NO₂)

9.11 ppb

101

361

1250

2050+

Carbon Monoxide (CO)

0.25 ppm

4.5

9.5

12.5

230.5

50.5+

Pollen Level

Low

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
2025-06-06T02:00:00.000Z	71 \| moderate	19.822 \| fine	79.43 \| fine	51.808 \| good	0.516 \| good	9.932 \| good	0.385 \| good
2025-06-06T03:00:00.000Z	84 \| moderate	20.658 \| fine	90.003 \| fine	65.048 \| fine	0.536 \| good	7.769 \| good	0.395 \| good
2025-06-06T04:00:00.000Z	87 \| moderate	20.757 \| fine	76.8 \| fine	65.957 \| fine	0.587 \| good	7.646 \| good	0.368 \| good
2025-06-06T05:00:00.000Z	71 \| moderate	20.146 \| fine	90.844 \| fine	52.353 \| good	0.729 \| good	12.526 \| good	0.276 \| good
2025-06-06T06:00:00.000Z	71 \| moderate	19.717 \| fine	69.777 \| fine	43.315 \| good	0.733 \| good	18.169 \| good	0.212 \| good
2025-06-06T07:00:00.000Z	62 \| moderate	14.628 \| fine	41.489 \| good	43.316 \| good	0.587 \| good	6.742 \| good	0.278 \| good
2025-06-06T08:00:00.000Z	66 \| moderate	16.588 \| fine	71.295 \| fine	38.189 \| good	0.57 \| good	7.851 \| good	0.262 \| good
2025-06-06T09:00:00.000Z	60 \| moderate	14.086 \| fine	55.598 \| fine	35.779 \| good	0.627 \| good	9.981 \| good	0.286 \| good
2025-06-06T10:00:00.000Z	66 \| moderate	16.616 \| fine	52.618 \| good	38.509 \| good	0.621 \| good	7.174 \| good	0.286 \| good
2025-06-06T11:00:00.000Z	66 \| moderate	17.061 \| fine	48.618 \| good	39.652 \| good	0.562 \| good	10.523 \| good	0.28 \| good
2025-06-06T12:00:00.000Z	67 \| moderate	18.401 \| fine	78.36 \| fine	42.104 \| good	0.583 \| good	13.133 \| good	0.262 \| good
2025-06-06T13:00:00.000Z	66 \| moderate	17.419 \| fine	52.873 \| good	28.22 \| good	0.621 \| good	10.814 \| good	0.242 \| good
2025-06-06T14:00:00.000Z	66 \| moderate	16.651 \| fine	70.829 \| fine	39.185 \| good	0.565 \| good	8.115 \| good	0.242 \| good
2025-06-06T15:00:00.000Z	62 \| moderate	15.126 \| fine	50.338 \| good	39.14 \| good	0.413 \| good	9.194 \| good	0.242 \| good
2025-06-06T16:00:00.000Z	62 \| moderate	14.952 \| fine	51.732 \| good	43.665 \| good	0.522 \| good	8.194 \| good	0.242 \| good
2025-06-06T17:00:00.000Z	60 \| moderate	13.707 \| fine	66.656 \| fine	51.26 \| good	0.402 \| good	6.562 \| good	0.208 \| good
2025-06-06T18:00:00.000Z	58 \| moderate	12.677 \| fine	48.57 \| good	45.707 \| good	0.448 \| good	6.267 \| good	0.242 \| good
2025-06-06T19:00:00.000Z	58 \| moderate	13.48 \| fine	48.031 \| good	39.05 \| good	0.413 \| good	8.407 \| good	0.263 \| good
2025-06-06T20:00:00.000Z	64 \| moderate	16.158 \| fine	61.33 \| fine	37.657 \| good	0.598 \| good	9.244 \| good	0.219 \| good
2025-06-06T21:00:00.000Z	64 \| moderate	15.671 \| fine	55.31 \| fine	33.653 \| good	0.823 \| good	10.894 \| good	0.274 \| good
2025-06-06T22:00:00.000Z	64 \| moderate	16.291 \| fine	48.668 \| good	33.522 \| good	0.622 \| good	9.116 \| good	0.262 \| good
2025-06-06T23:00:00.000Z	66 \| moderate	16.738 \| fine	51.544 \| good	27.808 \| good	0.725 \| good	12.114 \| good	0.238 \| good
2025-06-07T00:00:00.000Z	64 \| moderate	15.76 \| fine	52.403 \| good	26.625 \| good	0.753 \| good	22.728 \| good	0.272 \| good
2025-06-07T01:00:00.000Z	58 \| moderate	13.218 \| fine	58.256 \| fine	27.027 \| good	0.63 \| good	17.306 \| good	0.295 \| good
2025-06-07T02:00:00.000Z	56 \| moderate	11.921 \| good	21.56 \| good	38.782 \| good	0.561 \| good	14.648 \| good	0.319 \| good
2025-06-07T03:00:00.000Z	64 \| moderate	16.213 \| fine	57.476 \| fine	33.469 \| good	0.701 \| good	24.192 \| good	0.266 \| good
2025-06-07T04:00:00.000Z	69 \| moderate	19.36 \| fine	60.974 \| fine	37.679 \| good	0.688 \| good	14.676 \| good	0.26 \| good
2025-06-07T05:00:00.000Z	60 \| moderate	14.093 \| fine	60.83 \| fine	32.616 \| good	0.964 \| good	12.701 \| good	0.146 \| good
2025-06-07T06:00:00.000Z	33 \| good	6.25 \| good	29.634 \| good	34.331 \| good	0.947 \| good	28.061 \| good	0.146 \| good
2025-06-07T07:00:00.000Z	33 \| good	5.886 \| good	25.237 \| good	31.563 \| good	0.538 \| good	4.977 \| good	0.251 \| good
2025-06-07T08:00:00.000Z	67 \| moderate	17.996 \| fine	79.709 \| fine	28.965 \| good	0.574 \| good	5.357 \| good	0.251 \| good
2025-06-07T09:00:00.000Z	62 \| moderate	15.067 \| fine	40.973 \| good	24.175 \| good	0.596 \| good	6.215 \| good	0.267 \| good
2025-06-07T10:00:00.000Z	62 \| moderate	15.219 \| fine	60.903 \| fine	25.884 \| good	0.581 \| good	3.991 \| good	0.199 \| good
2025-06-07T11:00:00.000Z	60 \| moderate	13.964 \| fine	58.809 \| fine	19.912 \| good	0.541 \| good	4.085 \| good	0.2 \| good
2025-06-07T12:00:00.000Z	56 \| moderate	11.6 \| good	36.84 \| good	19.339 \| good	0.627 \| good	4.526 \| good	0.2 \| good
2025-06-07T13:00:00.000Z	60 \| moderate	14.435 \| fine	40.712 \| good	21.801 \| good	0.646 \| good	9.96 \| good	0.278 \| good
2025-06-07T14:00:00.000Z	66 \| moderate	17.057 \| fine	74.26 \| fine	16.251 \| good	0.725 \| good	9.813 \| good	0.278 \| good
2025-06-07T15:00:00.000Z	67 \| moderate	18.371 \| fine	55.197 \| fine	21.514 \| good	0.674 \| good	7.74 \| good	0.255 \| good
2025-06-07T16:00:00.000Z	64 \| moderate	15.542 \| fine	42.954 \| good	21.748 \| good	0.705 \| good	12.737 \| good	0.244 \| good
2025-06-07T17:00:00.000Z	66 \| moderate	16.679 \| fine	49.798 \| good	26.518 \| good	0.864 \| good	16.441 \| good	0.244 \| good
2025-06-07T18:00:00.000Z	52 \| moderate	8.229 \| good	57.463 \| fine	26.347 \| good	0.823 \| good	13.802 \| good	0.211 \| good
2025-06-07T19:00:00.000Z	56 \| moderate	12.42 \| fine	38.503 \| good	27.157 \| good	0.641 \| good	11.512 \| good	0.199 \| good
2025-06-07T20:00:00.000Z	49 \| good	9.239 \| good	23.925 \| good	29.201 \| good	0.645 \| good	9.105 \| good	0.253 \| good
2025-06-07T21:00:00.000Z	44 \| good	8.357 \| good	22.501 \| good	25.681 \| good	0.63 \| good	13 \| good	0.298 \| good
2025-06-07T22:00:00.000Z	44 \| good	7.807 \| good	25.001 \| good	30.812 \| good	0.568 \| good	8.22 \| good	0.264 \| good
2025-06-07T23:00:00.000Z	44 \| good	7.814 \| good	26.689 \| good	31.559 \| good	0.612 \| good	5.847 \| good	0.264 \| good
2025-06-08T00:00:00.000Z	44 \| good	7.847 \| good	30.342 \| good	30.356 \| good	0.636 \| good	5.404 \| good	0.254 \| good
2025-06-08T01:00:00.000Z	52 \| moderate	9.555 \| good	44.822 \| good	29.733 \| good	0.574 \| good	4.386 \| good	0.273 \| good
2025-06-07T20:00:00.000Z	49 \| good	9.239 \| good	23.925 \| good	29.201 \| good	0.645 \| good	9.105 \| good	0.253 \| good
2025-06-07T21:00:00.000Z	33 \| good	5.65 \| good	24.246 \| good	30.592 \| good	1.166 \| good	10.16 \| good	0.255 \| good
2025-06-07T22:00:00.000Z	52 \| moderate	9.855 \| good	43.745 \| good	34.589 \| good	0.837 \| good	9.887 \| good	0.279 \| good
2025-06-07T23:00:00.000Z	60 \| moderate	13.88 \| fine	62.378 \| fine	34.966 \| good	1.054 \| good	11.772 \| good	0.281 \| good
2025-06-08T00:00:00.000Z	49 \| good	9.021 \| good	40.262 \| good	34.631 \| good	1.27 \| good	13.656 \| good	0.284 \| good
2025-06-08T01:00:00.000Z	54 \| moderate	10.529 \| good	46.491 \| good	29.996 \| good	0.733 \| good	7.922 \| good	0.296 \| good
2025-06-08T02:00:00.000Z	56 \| moderate	12.457 \| fine	56.201 \| fine	28.59 \| good	0.832 \| good	9.43 \| good	0.297 \| good
2025-06-08T03:00:00.000Z	56 \| moderate	12.356 \| fine	56.394 \| fine	31.477 \| good	0.931 \| good	10.939 \| good	0.297 \| good
2025-06-08T04:00:00.000Z	52 \| moderate	10.219 \| good	45.557 \| good	35.846 \| good	0.714 \| good	5.762 \| good	0.33 \| good
2025-06-08T05:00:00.000Z	52 \| moderate	9.547 \| good	42.332 \| good	34.849 \| good	0.847 \| good	6.901 \| good	0.331 \| good
2025-06-08T06:00:00.000Z	52 \| moderate	9.902 \| good	43.664 \| good	31.452 \| good	0.98 \| good	8.04 \| good	0.331 \| good
2025-06-08T07:00:00.000Z	52 \| moderate	9.886 \| good	43.587 \| good	29.638 \| good	0.719 \| good	4.321 \| good	0.324 \| good
2025-06-08T08:00:00.000Z	56 \| moderate	11.735 \| good	51.573 \| good	26.181 \| good	0.862 \| good	5.455 \| good	0.332 \| good
2025-06-08T09:00:00.000Z	58 \| moderate	13.417 \| fine	60.995 \| fine	19.294 \| good	1.005 \| good	6.588 \| good	0.34 \| good
2025-06-08T10:00:00.000Z	56 \| moderate	12.476 \| fine	56.825 \| fine	20.851 \| good	0.734 \| good	3.598 \| good	0.323 \| good
2025-06-08T11:00:00.000Z	56 \| moderate	11.948 \| good	53.618 \| good	19.283 \| good	0.815 \| good	4.194 \| good	0.337 \| good
2025-06-08T12:00:00.000Z	52 \| moderate	10.439 \| good	46.21 \| good	22.796 \| good	0.896 \| good	4.791 \| good	0.351 \| good
2025-06-08T13:00:00.000Z	54 \| moderate	11.201 \| good	49.777 \| good	29.116 \| good	0.671 \| good	2.356 \| good	0.277 \| good
2025-06-08T14:00:00.000Z	56 \| moderate	12.339 \| fine	55.148 \| fine	32.108 \| good	0.701 \| good	2.557 \| good	0.277 \| good
2025-06-08T15:00:00.000Z	58 \| moderate	13.429 \| fine	60.692 \| fine	35.21 \| good	0.73 \| good	2.758 \| good	0.278 \| good
2025-06-08T16:00:00.000Z	62 \| moderate	14.797 \| fine	66.692 \| fine	35.678 \| good	0.599 \| good	1.96 \| good	0.251 \| good
2025-06-08T17:00:00.000Z	64 \| moderate	16.5 \| fine	72.957 \| fine	33.825 \| good	0.607 \| good	2.07 \| good	0.249 \| good
2025-06-08T18:00:00.000Z	69 \| moderate	18.574 \| fine	82.49 \| fine	34.659 \| good	0.616 \| good	2.179 \| good	0.248 \| good
2025-06-08T19:00:00.000Z	66 \| moderate	17.468 \| fine	76.95 \| fine	36.2 \| good	0.625 \| good	3.391 \| good	0.272 \| good
2025-06-08T20:00:00.000Z	66 \| moderate	17.381 \| fine	76.872 \| fine	34.979 \| good	0.64 \| good	3.596 \| good	0.273 \| good
2025-06-08T21:00:00.000Z	64 \| moderate	16.124 \| fine	71.093 \| fine	34.177 \| good	0.656 \| good	3.802 \| good	0.274 \| good
2025-06-08T22:00:00.000Z	64 \| moderate	15.915 \| fine	70.923 \| fine	34.564 \| good	0.75 \| good	6.847 \| good	0.306 \| good
2025-06-08T23:00:00.000Z	64 \| moderate	16.107 \| fine	71.18 \| fine	32.251 \| good	0.757 \| good	7.662 \| good	0.311 \| good
2025-06-09T00:00:00.000Z	58 \| moderate	12.905 \| fine	58.63 \| fine	28.72 \| good	0.764 \| good	8.477 \| good	0.315 \| good
2025-06-09T01:00:00.000Z	52 \| moderate	9.974 \| good	44.234 \| good	27.131 \| good	0.774 \| good	8.876 \| good	0.318 \| good
2025-06-09T02:00:00.000Z	44 \| good	8.111 \| good	35.251 \| good	30.229 \| good	0.763 \| good	10.836 \| good	0.332 \| good
2025-06-09T03:00:00.000Z	49 \| good	9.34 \| good	41.872 \| good	33.245 \| good	0.752 \| good	12.797 \| good	0.345 \| good
2025-06-09T04:00:00.000Z	54 \| moderate	10.571 \| good	46.933 \| good	35.67 \| good	0.711 \| good	4.304 \| good	0.287 \| good
2025-06-09T05:00:00.000Z	54 \| moderate	11.184 \| good	49.117 \| good	37.028 \| good	0.679 \| good	4.301 \| good	0.287 \| good
2025-06-09T06:00:00.000Z	54 \| moderate	10.664 \| good	47.054 \| good	36.885 \| good	0.648 \| good	4.298 \| good	0.288 \| good
2025-06-09T07:00:00.000Z	52 \| moderate	9.988 \| good	44.227 \| good	35.874 \| good	0.669 \| good	2.485 \| good	0.264 \| good
2025-06-09T08:00:00.000Z	56 \| moderate	11.668 \| good	51.155 \| good	33.707 \| good	0.654 \| good	2.433 \| good	0.262 \| good
2025-06-09T09:00:00.000Z	56 \| moderate	12.081 \| good	53.965 \| good	25.986 \| good	0.639 \| good	2.38 \| good	0.259 \| good
2025-06-09T10:00:00.000Z	54 \| moderate	11.26 \| good	49.885 \| good	25.062 \| good	0.606 \| good	3.981 \| good	0.253 \| good
2025-06-09T11:00:00.000Z	54 \| moderate	10.602 \| good	47.068 \| good	28.716 \| good	0.602 \| good	4.088 \| good	0.25 \| good
2025-06-09T12:00:00.000Z	54 \| moderate	11.184 \| good	49.328 \| good	28.763 \| good	0.599 \| good	4.194 \| good	0.246 \| good
2025-06-09T13:00:00.000Z	56 \| moderate	11.881 \| good	53.514 \| good	30.856 \| good	0.582 \| good	4.542 \| good	0.207 \| good
2025-06-09T14:00:00.000Z	56 \| moderate	11.745 \| good	51.669 \| good	31.152 \| good	0.59 \| good	4.494 \| good	0.197 \| good
2025-06-09T15:00:00.000Z	54 \| moderate	11.205 \| good	49.6 \| good	33.717 \| good	0.598 \| good	4.447 \| good	0.186 \| good
2025-06-09T16:00:00.000Z	54 \| moderate	10.689 \| good	47.613 \| good	36.664 \| good	0.595 \| good	3.612 \| good	0.167 \| good
2025-06-09T17:00:00.000Z	52 \| moderate	10.374 \| good	45.791 \| good	37.706 \| good	0.594 \| good	3.544 \| good	0.165 \| good
2025-06-09T18:00:00.000Z	52 \| moderate	10.156 \| good	44.84 \| good	37.868 \| good	0.593 \| good	3.476 \| good	0.163 \| good
2025-06-09T19:00:00.000Z	52 \| moderate	10.239 \| good	44.99 \| good	38.62 \| good	0.509 \| good	4.252 \| good	0.205 \| good
2025-06-09T20:00:00.000Z	54 \| moderate	10.604 \| good	46.727 \| good	36.392 \| good	0.52 \| good	4.241 \| good	0.207 \| good

Waltham

Get reliable air quality data to drive your business

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

0.20ppm

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 05:00:00 on 2025-06-07.

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 07:00:00 on 2025-06-07.

What is the AQI in Waltham, Massachusetts right now?

As of now, the AQI in Waltham, Massachusetts is 49, indicating Good conditions.

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

Waltham, Massachusetts air has the highest levels of PM2.5.

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 9.239 μg/m³.

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

The PM₁₀ concentration in Waltham, Massachusetts is 23.925 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 0.253 ppm.

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

Currently, Waltham, Massachusetts has a sulfur dioxide (SO₂) concentration of 0.645 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 29.201 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 9.105 ppb.

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Time	AQI	PM_2.5	PM₁₀	O₃	SO₂	NO₂	CO
2025-06-06T02:00:00.000Z	71 \| moderate	19.822 \| fine	79.43 \| fine	51.808 \| good	0.516 \| good	9.932 \| good	0.385 \| good
2025-06-06T03:00:00.000Z	84 \| moderate	20.658 \| fine	90.003 \| fine	65.048 \| fine	0.536 \| good	7.769 \| good	0.395 \| good
2025-06-06T04:00:00.000Z	87 \| moderate	20.757 \| fine	76.8 \| fine	65.957 \| fine	0.587 \| good	7.646 \| good	0.368 \| good
2025-06-06T05:00:00.000Z	71 \| moderate	20.146 \| fine	90.844 \| fine	52.353 \| good	0.729 \| good	12.526 \| good	0.276 \| good
2025-06-06T06:00:00.000Z	71 \| moderate	19.717 \| fine	69.777 \| fine	43.315 \| good	0.733 \| good	18.169 \| good	0.212 \| good
2025-06-06T07:00:00.000Z	62 \| moderate	14.628 \| fine	41.489 \| good	43.316 \| good	0.587 \| good	6.742 \| good	0.278 \| good
2025-06-06T08:00:00.000Z	66 \| moderate	16.588 \| fine	71.295 \| fine	38.189 \| good	0.57 \| good	7.851 \| good	0.262 \| good
2025-06-06T09:00:00.000Z	60 \| moderate	14.086 \| fine	55.598 \| fine	35.779 \| good	0.627 \| good	9.981 \| good	0.286 \| good
2025-06-06T10:00:00.000Z	66 \| moderate	16.616 \| fine	52.618 \| good	38.509 \| good	0.621 \| good	7.174 \| good	0.286 \| good
2025-06-06T11:00:00.000Z	66 \| moderate	17.061 \| fine	48.618 \| good	39.652 \| good	0.562 \| good	10.523 \| good	0.28 \| good
2025-06-06T12:00:00.000Z	67 \| moderate	18.401 \| fine	78.36 \| fine	42.104 \| good	0.583 \| good	13.133 \| good	0.262 \| good
2025-06-06T13:00:00.000Z	66 \| moderate	17.419 \| fine	52.873 \| good	28.22 \| good	0.621 \| good	10.814 \| good	0.242 \| good
2025-06-06T14:00:00.000Z	66 \| moderate	16.651 \| fine	70.829 \| fine	39.185 \| good	0.565 \| good	8.115 \| good	0.242 \| good
2025-06-06T15:00:00.000Z	62 \| moderate	15.126 \| fine	50.338 \| good	39.14 \| good	0.413 \| good	9.194 \| good	0.242 \| good
2025-06-06T16:00:00.000Z	62 \| moderate	14.952 \| fine	51.732 \| good	43.665 \| good	0.522 \| good	8.194 \| good	0.242 \| good
2025-06-06T17:00:00.000Z	60 \| moderate	13.707 \| fine	66.656 \| fine	51.26 \| good	0.402 \| good	6.562 \| good	0.208 \| good
2025-06-06T18:00:00.000Z	58 \| moderate	12.677 \| fine	48.57 \| good	45.707 \| good	0.448 \| good	6.267 \| good	0.242 \| good
2025-06-06T19:00:00.000Z	58 \| moderate	13.48 \| fine	48.031 \| good	39.05 \| good	0.413 \| good	8.407 \| good	0.263 \| good
2025-06-06T20:00:00.000Z	64 \| moderate	16.158 \| fine	61.33 \| fine	37.657 \| good	0.598 \| good	9.244 \| good	0.219 \| good
2025-06-06T21:00:00.000Z	64 \| moderate	15.671 \| fine	55.31 \| fine	33.653 \| good	0.823 \| good	10.894 \| good	0.274 \| good
2025-06-06T22:00:00.000Z	64 \| moderate	16.291 \| fine	48.668 \| good	33.522 \| good	0.622 \| good	9.116 \| good	0.262 \| good
2025-06-06T23:00:00.000Z	66 \| moderate	16.738 \| fine	51.544 \| good	27.808 \| good	0.725 \| good	12.114 \| good	0.238 \| good
2025-06-07T00:00:00.000Z	64 \| moderate	15.76 \| fine	52.403 \| good	26.625 \| good	0.753 \| good	22.728 \| good	0.272 \| good
2025-06-07T01:00:00.000Z	58 \| moderate	13.218 \| fine	58.256 \| fine	27.027 \| good	0.63 \| good	17.306 \| good	0.295 \| good
2025-06-07T02:00:00.000Z	56 \| moderate	11.921 \| good	21.56 \| good	38.782 \| good	0.561 \| good	14.648 \| good	0.319 \| good
2025-06-07T03:00:00.000Z	64 \| moderate	16.213 \| fine	57.476 \| fine	33.469 \| good	0.701 \| good	24.192 \| good	0.266 \| good
2025-06-07T04:00:00.000Z	69 \| moderate	19.36 \| fine	60.974 \| fine	37.679 \| good	0.688 \| good	14.676 \| good	0.26 \| good
2025-06-07T05:00:00.000Z	60 \| moderate	14.093 \| fine	60.83 \| fine	32.616 \| good	0.964 \| good	12.701 \| good	0.146 \| good
2025-06-07T06:00:00.000Z	33 \| good	6.25 \| good	29.634 \| good	34.331 \| good	0.947 \| good	28.061 \| good	0.146 \| good
2025-06-07T07:00:00.000Z	33 \| good	5.886 \| good	25.237 \| good	31.563 \| good	0.538 \| good	4.977 \| good	0.251 \| good
2025-06-07T08:00:00.000Z	67 \| moderate	17.996 \| fine	79.709 \| fine	28.965 \| good	0.574 \| good	5.357 \| good	0.251 \| good
2025-06-07T09:00:00.000Z	62 \| moderate	15.067 \| fine	40.973 \| good	24.175 \| good	0.596 \| good	6.215 \| good	0.267 \| good
2025-06-07T10:00:00.000Z	62 \| moderate	15.219 \| fine	60.903 \| fine	25.884 \| good	0.581 \| good	3.991 \| good	0.199 \| good
2025-06-07T11:00:00.000Z	60 \| moderate	13.964 \| fine	58.809 \| fine	19.912 \| good	0.541 \| good	4.085 \| good	0.2 \| good
2025-06-07T12:00:00.000Z	56 \| moderate	11.6 \| good	36.84 \| good	19.339 \| good	0.627 \| good	4.526 \| good	0.2 \| good
2025-06-07T13:00:00.000Z	60 \| moderate	14.435 \| fine	40.712 \| good	21.801 \| good	0.646 \| good	9.96 \| good	0.278 \| good
2025-06-07T14:00:00.000Z	66 \| moderate	17.057 \| fine	74.26 \| fine	16.251 \| good	0.725 \| good	9.813 \| good	0.278 \| good
2025-06-07T15:00:00.000Z	67 \| moderate	18.371 \| fine	55.197 \| fine	21.514 \| good	0.674 \| good	7.74 \| good	0.255 \| good
2025-06-07T16:00:00.000Z	64 \| moderate	15.542 \| fine	42.954 \| good	21.748 \| good	0.705 \| good	12.737 \| good	0.244 \| good
2025-06-07T17:00:00.000Z	66 \| moderate	16.679 \| fine	49.798 \| good	26.518 \| good	0.864 \| good	16.441 \| good	0.244 \| good
2025-06-07T18:00:00.000Z	52 \| moderate	8.229 \| good	57.463 \| fine	26.347 \| good	0.823 \| good	13.802 \| good	0.211 \| good
2025-06-07T19:00:00.000Z	56 \| moderate	12.42 \| fine	38.503 \| good	27.157 \| good	0.641 \| good	11.512 \| good	0.199 \| good
2025-06-07T20:00:00.000Z	49 \| good	9.239 \| good	23.925 \| good	29.201 \| good	0.645 \| good	9.105 \| good	0.253 \| good
2025-06-07T21:00:00.000Z	44 \| good	8.357 \| good	22.501 \| good	25.681 \| good	0.63 \| good	13 \| good	0.298 \| good
2025-06-07T22:00:00.000Z	44 \| good	7.807 \| good	25.001 \| good	30.812 \| good	0.568 \| good	8.22 \| good	0.264 \| good
2025-06-07T23:00:00.000Z	44 \| good	7.814 \| good	26.689 \| good	31.559 \| good	0.612 \| good	5.847 \| good	0.264 \| good
2025-06-08T00:00:00.000Z	44 \| good	7.847 \| good	30.342 \| good	30.356 \| good	0.636 \| good	5.404 \| good	0.254 \| good
2025-06-08T01:00:00.000Z	52 \| moderate	9.555 \| good	44.822 \| good	29.733 \| good	0.574 \| good	4.386 \| good	0.273 \| good
2025-06-07T20:00:00.000Z	49 \| good	9.239 \| good	23.925 \| good	29.201 \| good	0.645 \| good	9.105 \| good	0.253 \| good
2025-06-07T21:00:00.000Z	33 \| good	5.65 \| good	24.246 \| good	30.592 \| good	1.166 \| good	10.16 \| good	0.255 \| good
2025-06-07T22:00:00.000Z	52 \| moderate	9.855 \| good	43.745 \| good	34.589 \| good	0.837 \| good	9.887 \| good	0.279 \| good
2025-06-07T23:00:00.000Z	60 \| moderate	13.88 \| fine	62.378 \| fine	34.966 \| good	1.054 \| good	11.772 \| good	0.281 \| good
2025-06-08T00:00:00.000Z	49 \| good	9.021 \| good	40.262 \| good	34.631 \| good	1.27 \| good	13.656 \| good	0.284 \| good
2025-06-08T01:00:00.000Z	54 \| moderate	10.529 \| good	46.491 \| good	29.996 \| good	0.733 \| good	7.922 \| good	0.296 \| good
2025-06-08T02:00:00.000Z	56 \| moderate	12.457 \| fine	56.201 \| fine	28.59 \| good	0.832 \| good	9.43 \| good	0.297 \| good
2025-06-08T03:00:00.000Z	56 \| moderate	12.356 \| fine	56.394 \| fine	31.477 \| good	0.931 \| good	10.939 \| good	0.297 \| good
2025-06-08T04:00:00.000Z	52 \| moderate	10.219 \| good	45.557 \| good	35.846 \| good	0.714 \| good	5.762 \| good	0.33 \| good
2025-06-08T05:00:00.000Z	52 \| moderate	9.547 \| good	42.332 \| good	34.849 \| good	0.847 \| good	6.901 \| good	0.331 \| good
2025-06-08T06:00:00.000Z	52 \| moderate	9.902 \| good	43.664 \| good	31.452 \| good	0.98 \| good	8.04 \| good	0.331 \| good
2025-06-08T07:00:00.000Z	52 \| moderate	9.886 \| good	43.587 \| good	29.638 \| good	0.719 \| good	4.321 \| good	0.324 \| good
2025-06-08T08:00:00.000Z	56 \| moderate	11.735 \| good	51.573 \| good	26.181 \| good	0.862 \| good	5.455 \| good	0.332 \| good
2025-06-08T09:00:00.000Z	58 \| moderate	13.417 \| fine	60.995 \| fine	19.294 \| good	1.005 \| good	6.588 \| good	0.34 \| good
2025-06-08T10:00:00.000Z	56 \| moderate	12.476 \| fine	56.825 \| fine	20.851 \| good	0.734 \| good	3.598 \| good	0.323 \| good
2025-06-08T11:00:00.000Z	56 \| moderate	11.948 \| good	53.618 \| good	19.283 \| good	0.815 \| good	4.194 \| good	0.337 \| good
2025-06-08T12:00:00.000Z	52 \| moderate	10.439 \| good	46.21 \| good	22.796 \| good	0.896 \| good	4.791 \| good	0.351 \| good
2025-06-08T13:00:00.000Z	54 \| moderate	11.201 \| good	49.777 \| good	29.116 \| good	0.671 \| good	2.356 \| good	0.277 \| good
2025-06-08T14:00:00.000Z	56 \| moderate	12.339 \| fine	55.148 \| fine	32.108 \| good	0.701 \| good	2.557 \| good	0.277 \| good
2025-06-08T15:00:00.000Z	58 \| moderate	13.429 \| fine	60.692 \| fine	35.21 \| good	0.73 \| good	2.758 \| good	0.278 \| good
2025-06-08T16:00:00.000Z	62 \| moderate	14.797 \| fine	66.692 \| fine	35.678 \| good	0.599 \| good	1.96 \| good	0.251 \| good
2025-06-08T17:00:00.000Z	64 \| moderate	16.5 \| fine	72.957 \| fine	33.825 \| good	0.607 \| good	2.07 \| good	0.249 \| good
2025-06-08T18:00:00.000Z	69 \| moderate	18.574 \| fine	82.49 \| fine	34.659 \| good	0.616 \| good	2.179 \| good	0.248 \| good
2025-06-08T19:00:00.000Z	66 \| moderate	17.468 \| fine	76.95 \| fine	36.2 \| good	0.625 \| good	3.391 \| good	0.272 \| good
2025-06-08T20:00:00.000Z	66 \| moderate	17.381 \| fine	76.872 \| fine	34.979 \| good	0.64 \| good	3.596 \| good	0.273 \| good
2025-06-08T21:00:00.000Z	64 \| moderate	16.124 \| fine	71.093 \| fine	34.177 \| good	0.656 \| good	3.802 \| good	0.274 \| good
2025-06-08T22:00:00.000Z	64 \| moderate	15.915 \| fine	70.923 \| fine	34.564 \| good	0.75 \| good	6.847 \| good	0.306 \| good
2025-06-08T23:00:00.000Z	64 \| moderate	16.107 \| fine	71.18 \| fine	32.251 \| good	0.757 \| good	7.662 \| good	0.311 \| good
2025-06-09T00:00:00.000Z	58 \| moderate	12.905 \| fine	58.63 \| fine	28.72 \| good	0.764 \| good	8.477 \| good	0.315 \| good
2025-06-09T01:00:00.000Z	52 \| moderate	9.974 \| good	44.234 \| good	27.131 \| good	0.774 \| good	8.876 \| good	0.318 \| good
2025-06-09T02:00:00.000Z	44 \| good	8.111 \| good	35.251 \| good	30.229 \| good	0.763 \| good	10.836 \| good	0.332 \| good
2025-06-09T03:00:00.000Z	49 \| good	9.34 \| good	41.872 \| good	33.245 \| good	0.752 \| good	12.797 \| good	0.345 \| good
2025-06-09T04:00:00.000Z	54 \| moderate	10.571 \| good	46.933 \| good	35.67 \| good	0.711 \| good	4.304 \| good	0.287 \| good
2025-06-09T05:00:00.000Z	54 \| moderate	11.184 \| good	49.117 \| good	37.028 \| good	0.679 \| good	4.301 \| good	0.287 \| good
2025-06-09T06:00:00.000Z	54 \| moderate	10.664 \| good	47.054 \| good	36.885 \| good	0.648 \| good	4.298 \| good	0.288 \| good
2025-06-09T07:00:00.000Z	52 \| moderate	9.988 \| good	44.227 \| good	35.874 \| good	0.669 \| good	2.485 \| good	0.264 \| good
2025-06-09T08:00:00.000Z	56 \| moderate	11.668 \| good	51.155 \| good	33.707 \| good	0.654 \| good	2.433 \| good	0.262 \| good
2025-06-09T09:00:00.000Z	56 \| moderate	12.081 \| good	53.965 \| good	25.986 \| good	0.639 \| good	2.38 \| good	0.259 \| good
2025-06-09T10:00:00.000Z	54 \| moderate	11.26 \| good	49.885 \| good	25.062 \| good	0.606 \| good	3.981 \| good	0.253 \| good
2025-06-09T11:00:00.000Z	54 \| moderate	10.602 \| good	47.068 \| good	28.716 \| good	0.602 \| good	4.088 \| good	0.25 \| good
2025-06-09T12:00:00.000Z	54 \| moderate	11.184 \| good	49.328 \| good	28.763 \| good	0.599 \| good	4.194 \| good	0.246 \| good
2025-06-09T13:00:00.000Z	56 \| moderate	11.881 \| good	53.514 \| good	30.856 \| good	0.582 \| good	4.542 \| good	0.207 \| good
2025-06-09T14:00:00.000Z	56 \| moderate	11.745 \| good	51.669 \| good	31.152 \| good	0.59 \| good	4.494 \| good	0.197 \| good
2025-06-09T15:00:00.000Z	54 \| moderate	11.205 \| good	49.6 \| good	33.717 \| good	0.598 \| good	4.447 \| good	0.186 \| good
2025-06-09T16:00:00.000Z	54 \| moderate	10.689 \| good	47.613 \| good	36.664 \| good	0.595 \| good	3.612 \| good	0.167 \| good
2025-06-09T17:00:00.000Z	52 \| moderate	10.374 \| good	45.791 \| good	37.706 \| good	0.594 \| good	3.544 \| good	0.165 \| good
2025-06-09T18:00:00.000Z	52 \| moderate	10.156 \| good	44.84 \| good	37.868 \| good	0.593 \| good	3.476 \| good	0.163 \| good
2025-06-09T19:00:00.000Z	52 \| moderate	10.239 \| good	44.99 \| good	38.62 \| good	0.509 \| good	4.252 \| good	0.205 \| good
2025-06-09T20:00:00.000Z	54 \| moderate	10.604 \| good	46.727 \| good	36.392 \| good	0.52 \| good	4.241 \| good	0.207 \| good

Real-time 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)

Track live Waltham, Massachusetts air quality forecast and history

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

Air quality in nearby cities

Watertown, Massachusetts

Newton, Massachusetts

Belmont, Massachusetts

Weston, Massachusetts

Wellesley, Massachusetts

Arlington, Massachusetts

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Frequently asked questions

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What is the AQI in Waltham, Massachusetts right now?

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

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

What is the carbon monoxide (CO) 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?

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?