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Air quality in Boulder County

Air quality index (AQI⁺) and PM2.5 air pollution in Boulder County • 144.5K Followers • 22:00, Jan 11 Local time

Milliken AQI Alert nearby

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US AQI⁺

Good

Main pollutant:

O₃

82 µg/m³

-3°

23 km/h

49 %

Hourly forecast

Boulder County air quality index (AQI⁺) forecast

Now

-3°

km/h

49%

Mon

00:00

-2°

21.6

km/h

48%

01:00

-2°

21.6

km/h

47%

02:00

-2°

21.6

km/h

47%

03:00

-2°

21.6

km/h

47%

04:00

-1°

21.6

km/h

47%

05:00

-2°

21.6

km/h

46%

06:00

-2°

21.6

km/h

45%

07:00

-3°

21.6

km/h

44%

08:00

-2°

21.6

km/h

42%

09:00

2°

km/h

36%

10:00

4°

14.4

km/h

28%

11:00

6°

10.8

km/h

25%

12:00

7°

10.8

km/h

25%

13:00

7°

14.4

km/h

26%

14:00

6°

14.4

km/h

28%

15:00

5°

14.4

km/h

32%

16:00

3°

km/h

42%

17:00

0°

21.6

km/h

52%

18:00

-1°

21.6

km/h

50%

19:00

-1°

21.6

km/h

49%

20:00

-1°

21.6

km/h

48%

21:00

-1°

21.6

km/h

49%

22:00

-1°

21.6

km/h

49%

23:00

-1°

21.6

km/h

48%

Tue

00:00

-1°

21.6

km/h

48%

01:00

-1°

25.2

km/h

48%

02:00

-1°

25.2

km/h

48%

03:00

-1°

25.2

km/h

49%

04:00

-2°

25.2

km/h

50%

05:00

-1°

25.2

km/h

49%

06:00

-1°

25.2

km/h

49%

07:00

0°

21.6

km/h

47%

08:00

0°

21.6

km/h

46%

09:00

1°

21.6

km/h

43%

10:00

2°

21.6

km/h

43%

11:00

4°

21.6

km/h

37%

12:00

5°

21.6

km/h

34%

13:00

5°

21.6

km/h

35%

14:00

4°

21.6

km/h

37%

15:00

4°

21.6

km/h

41%

16:00

3°

km/h

45%

17:00

1°

km/h

50%

18:00

0°

km/h

50%

19:00

-1°

14.4

km/h

53%

20:00

-1°

14.4

km/h

55%

21:00

-1°

7.2

km/h

59%

22:00

-2°

7.2

km/h

70%

23:00

-3°

7.2

km/h

74%

Wed

00:00

-3°

7.2

km/h

76%

01:00

-3°

7.2

km/h

74%

02:00

-4°

7.2

km/h

75%

03:00

-4°

10.8

km/h

78%

04:00

-5°

10.8

km/h

80%

05:00

-5°

10.8

km/h

82%

06:00

-5°

10.8

km/h

82%

07:00

-5°

10.8

km/h

81%

08:00

-5°

10.8

km/h

75%

09:00

-1°

7.2

km/h

57%

10:00

0°

3.6

km/h

49%

11:00

1°

3.6

km/h

44%

12:00

2°

3.6

km/h

41%

13:00

2°

3.6

km/h

41%

14:00

2°

3.6

km/h

42%

15:00

2°

3.6

km/h

45%

16:00

1°

7.2

km/h

50%

17:00

-2°

10.8

km/h

66%

18:00

-3°

14.4

km/h

68%

19:00

-3°

km/h

66%

20:00

-3°

km/h

66%

21:00

-3°

km/h

66%

22:00

-3°

km/h

65%

23:00

-3°

km/h

64%

Daily forecast

Boulder County air quality index (AQI⁺) forecast

Today

7°

-3°

21.6

km/h

25%

Tue

5°

-3°

25.2

km/h

34%

Wed

2°

-5°

km/h

41%

Air pollutants

What is the current air quality in Boulder County?

PM2.5 concentration currently meets the WHO annual PM2.5 guideline.

Real-time Boulder County air pollution map

Health recommendations

Enjoy outdoor activities

Open your windows to bring clean, fresh air indoors

Get a monitor

Protect yourself from air pollution in Boulder County

Shop IQAir products

When the air becomes a problem – we provide relief

Monitor the air you breathe

Get accurate AirVisual air quality readings and real-time insights for cleaner air. Monitors that reveal pollution sources, highlight when air purifier use is needed.

AirVisual Series

Medical grade air purifiers

Trusted worldwide, the HealthPro Series uses HyperHEPA technology. Filters ultrafine particles other air purifiers miss, delivering medical-grade protection.

HealthPro Series

Powerful, stylish air purifiers

Compact and powerful, the Atem Series combines Swiss engineering with high-performance air purification, filtering ultrafine particles with HyperHEPA technology.

Atem Series

Pollen

What is the pollen count in Boulder County today?

Index

None

Tree None	0%
Grass None	0%
Weed None	0%

Source:

wetter.com

Pollen forecast in Boulder County

Health recommendations

Enjoy outdoor activities

Open your windows to bring clean, fresh air indoors

Get a monitor

Real-time Boulder County air pollution map

Pollen

What is the pollen count in Boulder County today?

Index

None

Tree None	0%
Grass None	0%
Weed None	0%

Source:

wetter.com

Pollen forecast in Boulder County

Protect yourself from air pollution in Boulder County

Shop IQAir products

When the air becomes a problem – we provide relief

Monitor the air you breathe

Get accurate AirVisual air quality readings and real-time insights for cleaner air. Monitors that reveal pollution sources, highlight when air purifier use is needed.

AirVisual Series

Medical grade air purifiers

Trusted worldwide, the HealthPro Series uses HyperHEPA technology. Filters ultrafine particles other air purifiers miss, delivering medical-grade protection.

HealthPro Series

Powerful, stylish air purifiers

Compact and powerful, the Atem Series combines Swiss engineering with high-performance air purification, filtering ultrafine particles with HyperHEPA technology.

Atem Series

Most polluted locations near Boulder County

Worldwide AQI⁺ ranking

Station ranking

Real-time USA AQI⁺ station ranking

#	Stations	AQI⁺ US
1	Aztec Central	66
2	1066 Berea Dr	28
3	1491 High St	23
4	16-7362 Crannell Dr	23
5	161 Swallow Ln	22
6	2095 Eisenhower Drive	22
7	47th Street	22
8	10th Street	21
9	285 Vail Cir	21
10	13th St	0

City ranking

Real-time USA AQI⁺ city ranking

#	Cities	AQI⁺ US
1	Happy Camp, California	139
2	Crescent City, California	124
3	Medford, Oregon	110
4	Portola, California	102
5	Delano, California	99
6	Susanville, California	97
7	Laytonville, California	94
8	Fair Oaks, California	93
9	Yuba City, California	93
10	Cottonwood Heights, Utah	91

History

Historic air quality graph for Boulder County

22 AQI⁺ US

Good

21:00–22:00 Jan 11 Local time

AQI⁺ US

Persian Gulf winter air quality: Why dust doesn’t disappear

January 11, 2026: Ho Chi Minh City among top 10 most polluted cities in the world

Southeast Europe Air Quality Alert

History

Historic air quality graph for Boulder County

22 AQI⁺ US

Good

21:00–22:00 Jan 11 Local time

AQI⁺ US

Persian Gulf winter air quality: Why dust doesn’t disappear

January 11, 2026: Ho Chi Minh City among top 10 most polluted cities in the world

Southeast Europe Air Quality Alert

Most polluted locations near Boulder County

Worldwide AQI⁺ ranking

Station ranking

Real-time USA AQI⁺ station ranking

#	Stations	AQI⁺ US
1	Aztec Central	66
2	1066 Berea Dr	28
3	1491 High St	23
4	16-7362 Crannell Dr	23
5	161 Swallow Ln	22
6	2095 Eisenhower Drive	22
7	47th Street	22
8	10th Street	21
9	285 Vail Cir	21
10	13th St	0

City ranking

Real-time USA AQI⁺ city ranking

#	Cities	AQI⁺ US
1	Happy Camp, California	139
2	Crescent City, California	124
3	Medford, Oregon	110
4	Portola, California	102
5	Delano, California	99
6	Susanville, California	97
7	Laytonville, California	94
8	Fair Oaks, California	93
9	Yuba City, California	93
10	Cottonwood Heights, Utah	91