Surface and Precipitation Stations - New Mexico Environment ...

Table 4-1
Monthly Relative Humidity Factors a
Class I Area Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Arches 2.6 2.3 1.8 1.6 1.6 1.3 1.4 1.5 1.6 1.6 2.0 2.3
Bandelier 2.2 2.1 1.8 1.6 1.6 1.4 1.7 2.1 1.9 1.7 2.0 2.3
Black Canyon of
the Gunnison
2.4 2.2 1.9 1.9 1.9 1.6 1.7 1.9 2.0 1.8 2.1 2.3
Canyonlands 2.6 2.3 1.7 1.6 1.5 1.2 1.3 1.5 1.6 1.6 2.0 2.3
Capitol Reef 2.7 2.4 2.0 1.7 1.6 1.4 1.4 1.6 1.6 1.7 2.1 2.5
Grand Canyon 2.4 2.3 1.9 1.5 1.4 1.2 1.4 1.7 1.6 1.6 1.9 2.3
Great Sand Dunes 2.4 2.3 2.0 1.9 1.9 1.8 1.9 2.3 2.2 1.9 2.4 2.4
La Garita 2.3 2.2 1.9 1.8 1.8 1.6 1.7 2.1 2.0 1.8 2.2 2.3
Maroon Bells
Snowmass
2.2 2.1 2.0 2.0 2.1 1.7 1.9 2.2 2.1 1.8 2.1 2.1
Mesa Verde 2.5 2.3 1.9 1.5 1.5 1.3 1.6 2.0 1.9 1.7 2.1 2.3
Pecos 2.3 2.1 1.8 1.7 1.7 1.5 1.8 2.1 2.0 1.7 2.0 2.2
Petrified Forest 2.4 2.2 1.7 1.4 1.3 1.2 1.5 1.8 1.7 1.6 1.9 2.3
San Pedro Parks 2.3 2.1 1.8 1.6 1.6 1.4 1.7 2.0 1.9 1.7 2.1 2.2
West Elk 2.3 2.2 1.9 1.9 1.9 1.7 1.8 2.1 2.0 1.8 2.1 2.2
Weminuche 2.4 2.2 1.9 1.7 1.7 1.5 1.6 2.0 1.9 1.7 2.1 2.3
Wheeler Peak 2.3 2.2 1.9 1.8 1.8 1.6 1.8 2.2 2.1 1.8 2.2 2.3
a Table A-3 of the EPA’s Guidance for Estimating Natural Visibility Conditions under the Regional
Haze Rule
Table 4-2
Average Annual Natural Background Levels a
Component
Average Annual Natural Background
(μg/m 3 )
Ammonium Sulfate 0.12
Ammonium Nitrate 0.10
Organic Carbon Mass 0.47
Elemental Carbon 0.02
Soil 0.50
Coarse Mass 3.0
a Table 2-1 of the EPA’s Guidance for Estimating Natural
Visibility Conditions under the Regional Haze Rule
4-5 4/13/2007