Table 2.
2011 IMPROVE ammonium sulfate light extinction (Mm−1) on most-impaired days, EPA estimates of anthropogenic and natural contributions, and CAMx-PSAT apportionment to U.S. anthropogenic, Canadian, Mexican, and shipping anthropogenic, boundary conditions, and North American natural contributions.
| 2011 IMPROVE most impaired days: ammonium sulfate aerosol light extinction (Mm−1) | |||||||
|---|---|---|---|---|---|---|---|
| EPA method | PSAT apportionment | ||||||
| Class I Areas | IMPROVE | Anthropogenic | Natural | U.S. anthropogenic | Canadian, Mexican, shipping anthropogenic | Boundary conditions | North American Natural (biogenic + fire) |
| Canyonlands NP, UT | 5.45 | 4.61 | 0.84 | 1.99 | 0.45 | 2.88 | 0.13 |
| Glacier NP, MT | 10.59 | 8.72 | 1.87 | 1.78 | 2.94 | 4.74 | 1.13 |
| Grand Canyon NP, AZ | 5.88 | 5.04 | 0.84 | 1.17 | 1.16 | 3.36 | 0.19 |
| Guadalupe Mountains NP, TX * | 13.95 | 12.73 | 1.21 | 4.85 | 5.44 | 3.50 | 0.15 |
| Jarbridge Wilderness, NV | 5.63 | 4.54 | 1.10 | 0.45 | 0.33 | 4.57 | 0.31 |
| Joshua Tree NP, CA | 9.55 | 8.55 | 1.00 | 2.39 | 1.78 | 4.83 | 0.55 |
| Olympic NP, WA | 16.43 | 14.18 | 2.26 | 2.68 | 5.11 | 7.63 | 1.01 |
| Mesa Verde NP, CO | 6.37 | 5.40 | 0.96 | 2.08 | 1.06 | 3.11 | 0.11 |
| Rocky Mountain NP, CO | 6.76 | 5.65 | 1.10 | 2.60 | 0.64 | 3.37 | 0.15 |
| Sequoia NP, CO | 14.51 | 13.64 | 0.88 | 1.81 | 1.00 | 11.23 | 0.47 |
| Theodore Roosevelt NP, ND | 17.80 | 16.13 | 1.67 | 10.25 | 4.14 | 3.30 | 0.11 |
| Yellowstone NP, WY | 5.36 | 4.23 | 1.13 | 1.22 | 0.24 | 3.70 | 0.20 |
*
The IMPROVE monitor at Guadalupe Mountains NP, TX, also represents Carlsbad Caverns NP, NM.