Measurement Region Annual Average, 2000–2002 Annual Average, 2016–2018 Percent Change
Dry Nitrogen Deposition
(kg-N/ha)
Mid-Atlantic 9.9 6.1 -38
Midwest 7.0 5.0 -29
North Central 4.7 4.7 0
Northeast 6.1 3.4 -44
Pacific 2.7 2.2 -19
Rocky Mountain 2.3 2.0 -13
South Central 5.8 4.9 -16
Southeast 6.7 4.5 -33
Wet Nitrogen Deposition
(kg-N/ha)
Mid-Atlantic 4.8 4.0 -17
Midwest 5.9 5.4 -8.0
North Central 4.5 5.1 13
Northeast 4.8 3.3 -31
Pacific 1.0 1.1 10
Rocky Mountain 1.5 1.6 7.0
South Central 4.0 4.0 0
Southeast 4.0 3.5 -13
Total Deposition of Nitrogen
(kg-N/ha)
Mid-Atlantic 14.7 10 -32
Midwest 12.9 10.4 -19
North Central 9.2 9.8 7.0
Northeast 10.9 6.7 -39
Pacific 3.7 3.3 -11
Rocky Mountain 3.8 3.6 -5.0
South Central 9.8 9.0 -8.0
Southeast 10.7 8.0 -25
Total Deposition of Oxidized Nitrogen
(kg-N/ha)
Mid-Atlantic 11.4 6.0 -47
Midwest 8.8 5.0 -43
North Central 4.6 3.5 -24
Northeast 8.4 4.2 -50
Pacific 2.7 1.7 -37
Rocky Mountain 2.6 1.9 -27
South Central 6.6 4.9 -26
Southeast 8.1 4.6 -43
Total Deposition of Reduced Nitrogen
(kg-N/ha)
Mid-Atlantic 3.3 4.0 21
Midwest 4.2 5.4 29
North Central 4.5 6.3 40
Northeast 2.5 2.5 0
Pacific 1.1 1.5 36
Rocky Mountain 1.2 1.7 42
South Central 3.2 4.1 28
Southeast 2.7 3.4 26
Dry Sulfur Deposition
(kg-S/ha)
Mid-Atlantic 10.5 1.4 -87
Midwest 8.2 1.6 -80
North Central 1.8 0.70 -61
Northeast 5.6 1.1 -80
Pacific 0.60 0.30 -50
Rocky Mountain 0.60 0.40 -33
South Central 2.0 0.90 -55
Southeast 4.6 0.90 -80
Wet Sulfur Deposition
(kg-S/ha)
Mid-Atlantic 6.0 1.8 -70
Midwest 5.5 2.0 -64
North Central 2.3 1.3 -43
Northeast 5.1 1.4 -73
Pacific 0.60 0.40 -33
Rocky Mountain 0.70 0.50 -29
South Central 3.8 2.5 -34
Southeast 4.8 2.0 -58
Total Deposition of Sulfur
(kg-S/ha)
Mid-Atlantic 16.6 3.2 -81
Midwest 13.7 3.6 -74
North Central 4.1 2.1 -49
Northeast 10.7 2.6 -76
Pacific 1.2 0.70 -42
Rocky Mountain 1.3 0.90 -31
South Central 5.8 3.3 -43
Southeast 9.4 2.9 -69