Back to Air Quality Table of Contents
Acid Deposition in Eastern North America
Map 1980 Annual Mean pH Distribution
Source: Chul-Un Ro, 2000. Pers. Com. Senior Scientist. Air Quality Measurement and Analysis Research Division, Meteorological Service of Canada, Environment Canada, March 9.Map 1996 Annual Mean pH Distribution
Source: Chul-Un Ro, 2000. Pers. Com. Senior Scientist. Air Quality Measurement and Analysis Research Division, Meteorological Service of Canada, Environment Canada, March 9.Map 1980 WET EXCESS SO4 DEPOSITION (kg/ha/yr)
Source: Chul-Un Ro, 1999. Pers. Com. Senior Scientist. Air Quality Measurement and Analysis Research Division, Meteorological Service of Canada, Environment Canada, April 27.Map 1996 WET EXCESS SO4 DEPOSITION (kg/ha/yr)
Source: Chul-Un Ro, 1999. Pers. Com. Senior Scientist. Air Quality Measurement and Analysis Research Division, Meteorological Service of Canada, Environment Canada, April 27.Acid deposition maps were produced using a large number of networks, all of which are under the umbrella of the National Atmospheric Chemistry (NAtChem) network. NAtChem is a central archival and data analysis facility, whose purpose is to support atmospheric research based on air and precipitation chemistry data. NAtChem Database contains air and precipitation chemistry data from major regional-scale networks in North America. To contribute to NAtChem, networks must have operated for a period of at least two years, must have wide area coverage, and must have regionally re
The collection periods in each of the networks vary, and it could be one day, a week or four weeks. They nevertheless, provide the basis for the pH and the excess SO4 deposition in Easter North America. The objectives and methods of NAtChem are described elsewhere. Data are collected from Canadian federal and provincial networks and major U.S. networks. For this report, 1995 data were obtained from one federal, five provincial and two American networks. All sites were operated and maintained by the individual networks. These networks operated 118 precipitation chemistry monitoring sites in eastern Canada (east of Manitoba) and 105 sites in the eastern U.S. (east of the Mississippi River) in 1995. This area stretches from the southern tip of Florida to latitude 55o North, and from the Atlantic coast to the limits which define eastern North America, as described above. Presently, NAtChem is composed of the following number of sites per network.
| CAPMoN | 19 | Canadian Air and Precipitation Monitoring Network (Environment Canada) |
| APIOS-C | 15 | Acidic Precipitation in Ontario Study – Cumulative Network (Ontario Ministry of the Environment and Energy) |
| APIOS-D | 1 | Acidic Precipitation in Ontario Study – Daily Network (Ontario Ministry of the Environment and Energy) |
| REPQ | 39 | Réseau d’échantillonnage des précipitations du Québec (Ministère de l’Environnement et de la Faune du Québec) |
| NBPMN | 13 | New Brunswick Precipitation Monitoring Network (New Brunswick Department of the Environment) |
| NSPSN | 1 | Nova Scotia Precipitation Study Network (Nova Scotia Department of the Environment) |
| NEPMoN | 2 | Newfoundland Acid Precipitation Monitoring Network (Newfoundland Department of Environment) |
| MNPC | 0 | Manitoba Network for Precipitation Collection (Manitoba Environment) |
| PQMPA | 10 | Precipitation Quality Monitoring Program in Alberta (Alberta Environment) |
| BCPCSN | 9 | British Columbia Precipitation Chemistry Sampling Network (British Columbia Ministry of Environment, Lands and Parks) |
| NADP | 199 | National Atmospheric Deposition Program / National Trends Network (United States NADP/NTN Coordination Office) |
| CASTNet | 18 | Clean Air Status and Trends Network (United States Environmental Protection Agency) |
CANADA: 109, U.S.: 217