![[logo] US EPA](http://www.epa.gov/epafiles/images/logo_epaseal.gif){kind=logo}
Cooperation on Emission Inventories, Trends, and Mapping
Table of Contents
- Working Together for Cleaner Air
- Pollutants and their Effects
- The Acid Rain Challenge
- Preserving Air Quality for Today and Tomorrow
- Key Commitments of the Ozone Annex
- Progress on Ground-Level Ozone
- Other Air Quality Programs
- Cooperation on Emission Inventories, Trends, and Mapping
- Research Efforts on Effects of Air Pollution
- A History of Cooperation
- For More Information
Accurate emission inventories and public availability of data are integral to the success of both nations’ emission reduction goals and air quality management programs. Emission inventories help identify the major sources of pollution, track the progress of control strategies, and provide important data for use in air quality models. Figures 8, 9, and 10 present emission trends estimates for total SO2, NOx, and VOCs for both Canada and the United States, reflecting data measured at many large sources as well as new methodologies for developing estimates.
Figure 8: Canada/U.S. Total SO2 Emissions, 1980-2010
Figure 9: Canada/U.S. Total NOx Emissions, 1980-2010
Figure 10: Canada/U.S. Total VOC Emissions, 1980-2010
Wet Sulfate and Nitrate Deposition in 1990-1994 and 1996-2000
Long-term environmental monitoring in Canada and the United States through well-established networks continues to play an essential role in evaluating the efficacy of air pollution control programs. Canada and the United States jointly developed these maps, which illustrate sulfate and nitrate wet deposition across eastern North America over two different five-year periods (1990-1994 and 1996-2000). As illustrated in Figures 11 and 12, SO2 emission reductions resulted in a significant decrease in wet sulfate deposition over a large
section of eastern North America. During these same time periods, however, wet nitrate deposition remained relatively unchanged, as illustrated in Figures 13 and 14.
Wet Sulfate Deposition
Wet Nitrate Deposition
AIRNOW Mapping
EPA’s AIRNOW, a real-time air quality information and mapping system for the United States, has been expanded to include data and air quality maps from seven Canadian provinces: British Columbia, New Brunswick, Newfoundland, Nova Scotia, Ontario, Prince Edward Island, and Quebec. AIRNOW provides hourly information on pollution levels via the Internet to public officials, health professionals, the media, and citizens to enable them to take proper steps to protect public health. The AIRNOW Web site is http://www.epa.gov/airnow.