Air Quality Index

 

 

Fort Defiance
PM10

Shiprock
PM10

Crownpoint
PM10

Tuba City
PM10

Nazlini
PM 2.5

Nazlini
PM 2.5

January 2010

14

13

15

14

2

2

February 2010

8

0

15

17

7

8

March 2010

6

0

17

21

8

6

April 2010

7

0

13

26

12

12

May 2010

6

0

20

28

10

11

June 2010

24

23

19

22

16

14

July 2010

22

19

13

34

15

16

August 2010

13

31

15

29

TBA

TBA

September 2010

10

TBA

23

35

TBA

TBA

October 2010

TBA

TBA

TBA

TBA

TBA

TBA

November 2010

TBA

TBA

TBA

TBA

TBA

TBA

December 2010

TBA

TBA

TBA

TBA

TBA

TBA

For a list of the 2009 Acheived monthly Air Quaity Index, please click here.

The AQI is an index for reporting air quality. It tells you how clean or polluted your air is, and what associated health effects might be a concern for you. The AQI focuses on health effects you may experience within a few hours or days after breathing polluted air. EPA calculates the AQI for five major air pollutants regulated by the Clean Air Act: ground-level ozone, particle pollution (also known as particulate matter), carbon monoxide, sulfur dioxide, and nitrogen dioxide. For each of these pollutants, EPA has established national air quality standards to protect public health .Ground-level ozone and airborne particles are the two pollutants that pose the greatest threat to human health in this country.

How Does the AQI Work?

Think of the AQI as a yardstick that runs from 0 to 500. The higher the AQI value, the greater the level of air pollution and the greater the health concern. For example, an AQI value of 50 represents good air quality with little potential to affect public health, while an AQI value over 300 represents hazardous air quality.

An AQI value of 100 generally corresponds to the national air quality standard for the pollutant, which is the level EPA has set to protect public health. AQI values below 100 are generally thought of as satisfactory. When AQI values are above 100, air quality is considered to be unhealthy-at first for certain sensitive groups of people, then for everyone as AQI values get higher.

Understanding the AQI

The purpose of the AQI is to help you understand what local air quality means to your health. To make it easier to understand, the AQI is divided into six categories:

Air Quality Index
(AQI) Values)
Levels of Health Concern Colors Meaning
When the AQI is in this range: ...air quality conditions are: ..as symbolized by this color: This what some situations could fall under.
0-50
Good
Green
Air quality is considered satisfactory, and air pollution poses little or no risk
51-100
Moderate
Yellow
Air quality is acceptable; however, for some pollutants there may be a moderate health concern for a very small number of people who are unusually sensitive to air pollution.
101-150
Unhealthy for Sensitive Groups
Orange
Members of sensitive groups may experience health effects. The general public is not likely to be affected.
151 to 200
Unhealthy
Red
Everyone may begin to experience health effects; members of sensitive groups may experience more serious health effects.
201 to 300
Very Unhealthy
Purple
Health alert: everyone may experience more serious health effects
301 to 500
Hazardous
Maroon
Health warnings of emergency conditions. The entire population is more likely to be affected.

Each category corresponds to a different level of health concern. The six levels of health concern and what they mean are:

Data before AQI or Concentration Values

 

Fort Defiance
PM10

Shiprock
PM10

Crownpoint
PM10

Tuba City
PM10

Nazlini
PM 2.5

Nazlini
PM 2.5

January 2010

14.86

13.97

15.85

15.11

2.06

2.19

February 2010

8.57

0

15.61

18.01

2.08

2.56

March 2010

6.92

0

14.31

23.20

2.58

1.91

April 2010

7.87

0

14.31

28.13

3.56

3.70

May 2010

6.98

0

22.40

30.00

3.06

3.48

June 2010

7.65

0

20.33

23.40

4.79

4.26

July 2010

6.77

25.20

14.42

36.79

4.60

5.02

August 2010

3.85

19.92

15.63

31.34

4.11

3.86

September 2010

3.16

33.86

24.76

38.41

3.22

2.46

October 2010

7.26

21.70

15.33

17.01

2.81

3.13

November 2010

8.18

m 22.70

19.34

15.75

1.51

1.72

December 2010

7.70

15.58

11.64

16.72

1.82

2.11

January 2011

9.10

19.60

13.42

17.88

1.21

1.88

Shiprock 2010/2011 Gaseous Analyzer Monthly (Hour Averages)

Months

Ozone

NO2

SO2

January

20.02

14.84

1.42

February

29.44

7.84

0.94

March

35.23

5.41

0.63

April

39.81

4.48

1.59

May

43.16

3.10

1.35

June

41.83

4.16

1.08

July

42.08

4.48

1.54

August

45.10

5.78

1.90

September

60.72

6.81

2.93

October

59.17

6.37

1.66

November

34.92

7.69

1.92

December

20.45

9.42

1.00

January 2011

35.78

12.39

0.54