1. Tribes in the Lower 48 States

2. Alaskan Tribes

3. Tribal Air Monitoring Sites – Criteria Poll. Created by the Inter-Tribal Environmental council of Oklahoma. Data represent a snapshot of 2001-2002. Pollutants PM2.5 PM10 OZONE CO SO2 NOx

4. Tribal Air Monitoring Sites - IMPROVE Created by the Inter-Tribal Environmental council of Oklahoma. Data represent a snapshot of 2001-2002.

5. Tribal Air Monitoring Sites – Other Pollutants MERCURY NADP CASTNET Acid Deposition Empact TSP Flouride Acid Rain PAH Metals Pb Created by the Inter-Tribal Environmental council of Oklahoma. Data represent a snapshot of 2001-2002.

6. Tribal Air Monitoring Sites - All Yellow = Criteria Pollutants Red = IMPROVE Green = Other Created by the Inter-Tribal Environmental council of Oklahoma. Data represent a snapshot of 2001-2002.

7. Tribes & Class 1 Areas in the Lower 48

8. Tribes & Class 1 Areas in Alaska

9. 500 Largest SO 2 Emitters in 1999 NEI * Account for 89% of the SO 2 emissions from the 28,975 facilities that reported.

10. 500 Largest NOx Emitters in 1999 NEI * Account for 69% of the SO 2 emissions from the 33,282 facilities that reported.

11. 500 Largest PM-2.5 Emitters in 1999 NEI * Account for 56% of the SO 2 emissions from the 37,290 facilities that reported.

12. Summary of 1999 NEI Criteria Emissions ** Results are preliminary due to boundary disputes and errors in the NEI database. * Tribal land (historical boundaries) comprises ~ 5 % of the land area of the U.S.