Add

Air quality in Boulder County

Air quality index (AQI⁺) and PM2.5 air pollution in Boulder County • 132.2K Followers • 13:00, Sep 16 Local time

US AQI⁺

Good

Main pollutant:

O₃

72 µg/m³

64°

7 km/h

33 %

Hourly forecast

Boulder County air quality index (AQI⁺) forecast

Now

64°

km/h

33%

14:00

90%

63°

2.2

km/h

37%

15:00

100%

61°

2.2

km/h

46%

16:00

59°

km/h

48%

17:00

59°

2.2

km/h

45%

18:00

100%

52°

6.7

km/h

77%

19:00

100%

50°

2.2

km/h

85%

20:00

100%

48°

6.7

km/h

82%

21:00

48°

6.7

km/h

82%

22:00

48°

6.7

km/h

81%

23:00

48°

6.7

km/h

80%

Wed

00:00

90%

46°

4.5

km/h

81%

01:00

100%

45°

km/h

83%

02:00

43°

km/h

88%

03:00

41°

4.5

km/h

87%

04:00

41°

6.7

km/h

86%

05:00

39°

6.7

km/h

84%

06:00

41°

6.7

km/h

82%

07:00

37°

6.7

km/h

86%

08:00

43°

6.7

km/h

79%

09:00

46°

2.2

km/h

67%

10:00

50°

km/h

55%

11:00

54°

km/h

45%

12:00

57°

km/h

39%

13:00

60%

57°

km/h

37%

14:00

80%

59°

km/h

36%

15:00

59°

2.2

km/h

35%

16:00

57°

6.7

km/h

41%

17:00

100%

54°

4.5

km/h

56%

18:00

100%

48°

4.5

km/h

70%

19:00

100%

45°

km/h

82%

20:00

100%

41°

2.2

km/h

88%

21:00

41°

2.2

km/h

88%

22:00

41°

4.5

km/h

89%

23:00

39°

4.5

km/h

88%

Thu

00:00

39°

2.2

km/h

88%

01:00

39°

2.2

km/h

87%

02:00

37°

4.5

km/h

85%

03:00

37°

2.2

km/h

86%

04:00

37°

2.2

km/h

86%

05:00

37°

4.5

km/h

85%

06:00

36°

4.5

km/h

86%

07:00

36°

4.5

km/h

85%

08:00

41°

2.2

km/h

75%

09:00

46°

km/h

65%

10:00

50°

km/h

55%

11:00

54°

2.2

km/h

47%

12:00

55°

2.2

km/h

43%

13:00

57°

4.5

km/h

39%

14:00

57°

6.7

km/h

38%

15:00

30%

57°

6.7

km/h

42%

16:00

57°

6.7

km/h

43%

17:00

55°

6.7

km/h

44%

18:00

54°

4.5

km/h

48%

19:00

46°

km/h

66%

20:00

45°

4.5

km/h

70%

21:00

43°

6.7

km/h

71%

22:00

43°

6.7

km/h

71%

23:00

43°

6.7

km/h

66%

Fri

00:00

43°

6.7

km/h

58%

01:00

43°

8.9

km/h

52%

02:00

43°

8.9

km/h

49%

03:00

41°

8.9

km/h

47%

04:00

41°

8.9

km/h

46%

05:00

41°

8.9

km/h

46%

06:00

41°

8.9

km/h

47%

07:00

41°

11.2

km/h

47%

08:00

46°

8.9

km/h

42%

09:00

55°

4.5

km/h

29%

10:00

59°

2.2

km/h

21%

11:00

63°

km/h

18%

12:00

64°

km/h

18%

13:00

66°

2.2

km/h

18%

Daily forecast

Boulder County air quality index (AQI⁺) forecast

Today

100%

64°

43°

6.7

km/h

34%

Wed

100%

59°

37°

6.7

km/h

39%

Thu

40%

57°

36°

6.7

km/h

43%

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

Pollen

What is the pollen count in Boulder County today?

Index

Low

Tree None	0%
Grass Low	25%
Weed Low	25%

Source:

tomorrow.io

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

Low

Tree None	0%
Grass Low	25%
Weed Low	25%

Source:

tomorrow.io

Pollen forecast in Boulder County

Most polluted locations near Boulder County

Worldwide AQI⁺ ranking

Station ranking

Real-time USA AQI⁺ station ranking

#	Stations	AQI⁺ US
1	1066 Berea Dr	41
2	South 42nd Street	33
3	Heritage 2 : S Cleveland	32
4	Kenosha Rd	32
5	Aztec Central	31
6	Grove Street	31
7	Walker Ranch, Pine Needle Notch	31
8	10th Street	30
9	16-7362 Crannell Dr	30
10	Grape Avenue	30

City ranking

Real-time USA AQI⁺ city ranking

#	Cities	AQI⁺ US
1	Auberry, California	296
2	Shaver Lake, California	199
3	North Fork, California	163
4	Oakhurst, California	134
5	Mariposa County, California	132
6	Catheys Valley, California	118
7	Inchelium, Washington	117
8	East Wenatchee, Washington	93
9	Madera County, California	89
10	Coulee Dam, Washington	87

History

Historic air quality graph for Boulder County

29 AQI⁺ US

Good

12:00 Sep 16 Local time

AQI⁺ US

September 16, 2025: Beijing among top 10 cleanest cities in the world

September 16, 2025: Almaty among top 10 most polluted cities in the world

Wildfire Map Spotlight: Garnet Fire, California

History

Historic air quality graph for Boulder County

29 AQI⁺ US

Good

12:00 Sep 16 Local time

AQI⁺ US

September 16, 2025: Beijing among top 10 cleanest cities in the world

September 16, 2025: Almaty among top 10 most polluted cities in the world

Wildfire Map Spotlight: Garnet Fire, California

Most polluted locations near Boulder County

Worldwide AQI⁺ ranking

Station ranking

Real-time USA AQI⁺ station ranking

#	Stations	AQI⁺ US
1	1066 Berea Dr	41
2	South 42nd Street	33
3	Heritage 2 : S Cleveland	32
4	Kenosha Rd	32
5	Aztec Central	31
6	Grove Street	31
7	Walker Ranch, Pine Needle Notch	31
8	10th Street	30
9	16-7362 Crannell Dr	30
10	Grape Avenue	30

City ranking

Real-time USA AQI⁺ city ranking

#	Cities	AQI⁺ US
1	Auberry, California	296
2	Shaver Lake, California	199
3	North Fork, California	163
4	Oakhurst, California	134
5	Mariposa County, California	132
6	Catheys Valley, California	118
7	Inchelium, Washington	117
8	East Wenatchee, Washington	93
9	Madera County, California	89
10	Coulee Dam, Washington	87