Metro Area definitions control the way sites are grouped together in the Air Quality Index report, the Ozone Action Day Forecast page, as well as how ozone alerts are generated (mostly).
| Region |
Metro Area |
County |
Sites |
|
Number |
Name |
1 -- CT-ME-MA-NH-RI-VT
2 active sites |
12 |
Pleasant Point |
Washington |
Sipayik TAQP-ME |
| 15 |
Penobscot |
Penobscot |
Penobscot Indian Nation-ME |
| 2 -- NJ-NY-PR-VI |
14 |
St Regis |
Franklin |
Saint Regis Mohawk Tribe-NY |
| 4 -- KY-TN-NC-SC-MS-AL-GA-FL |
22 |
Cherokee |
Swain |
Eastern Band Of Cherokee Indians-NC |
| 5 -- MN-WI-IL-MI-IN-OH |
17 |
Sault Ste Marie |
Chippewa |
InterTribal Council of Michigan-LSSU-MI |
| 6 -- NM-TX-OK-AR-LA |
7 |
Alabama-Coushatta |
No active sites in this metro area |
8 -- MT-ND-WY-SD-UT-CO
3 active sites |
6 |
Polson-Ronan |
Lake |
Ronan-MT |
| Lake |
Polson-MT |
| Lake |
Jette-MT |
9 -- CA-NV-AZ-HI-AS-GU
10 active sites |
1 |
Fort McDowell |
Maricopa |
Fort McDowell Eagle View-AZ |
| Maricopa |
Fort McDowell Yuma Frank-AZ |
| 2 |
Lone Pine |
Inyo |
Lone Pine Paiute/Shoshone Tribe-CA |
| 3 |
Bishop |
Inyo |
Bishop Paiute Tribe-CA |
| 4 |
Fort Independence |
Inyo |
Fort Independence Met1-CA |
| 5 |
Big Pine |
Inyo |
Big Pine-CA |
| 8 |
Walker River |
Mineral |
Walker River Paiute Tribe-NV |
| 9 |
Pyramid Lake |
Washoe |
North Lake-NV |
| Washoe |
Wadsworth-NV |
| 11 |
Las Vegas |
Clark |
TAMS2 PAD-NV |
10 -- WA-OR-ID-AK
6 active sites |
13 |
Warm Springs |
Jefferson |
Warm Springs Monitoring-OR |
| 16 |
Coos Bay |
Coos |
CTCLUSI Radar Hill-OR |
| 18 |
Lapwai |
Nez Perce |
Nez Perce Tribe Lapwai-ID |
| 19 |
Fort Hall |
Bannock |
Shoshone Bannock Tribes-ID |
| 20 |
Reubens |
Nez Perce |
Nez Perce Tribe Reubens-ID |
| 21 |
Kamiah |
Idaho |
Nez Perce Tribe Kamiah-ID |
Not having a Metro Area defined is not necessarily an error. Some sites (such as the water sites or test sites) are never intended to be included in any metro areas.
