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Cooperation on Emissions Monitoring and Inventories


AIRNow Mapping

The EPA-led AIRNow program (www.airnow.gov) provides the public with easy access to real-time air quality information. Since 2001, the jurisdictions in the United States and Canada have collaborated to contribute air quality data to the AIRNow program. In 2004, the AIRNow Web site was expanded to provide information on PM and ozone measurements on a continental scale year-round. Canadian and U.S. efforts continue to improve air quality characterization by combining measurements with numerical forecasts from the operational air quality forecasting model. Each country is improving air quality forecasting services and continuing to develop national air quality forecast models.

Emission Trends and Inventories

Ensuring that emission inventories are publicly available contributes 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 11, 12, and 13 show emission trends for total SO2, NOX, and VOCs in Canada and the United States from 1990 to 2006.

In the United States, the major reductions in SO2 emissions from 1990 to 2006 came from electric power generation sources. For NOX, the reductions came from on-road mobile sources and electric power generation sources. For VOCs, the reductions were from on-road mobile sources, waste disposal and recycling, and chemical and allied products manufacturing and use.

In Canada, the major reductions in SO2 emissions came from base metal smelters in the industrial sector. For NOX, the reductions were from on-road mobile sources, electric power generation sources, and industrial sources. For VOCs, the reductions came from electric power generation sources, on-road mobile sources, and solvent utilization.

Figure 11. U.S. and Canadian SO2 Emissions, 1990–2006

Figure 11. U.S. and Canadian SO2 Emissions, 1990–2006
Source: EPA and Environment Canada, 2008

Figure 12. U.S. and Canadian NOX Emissions, 1990–2006

Figure 12. U.S. and Canadian NOX Emissions, 1990–2006
Source: EPA and Environment Canada, 2008

Figure 13. U.S. and Canadian VOC Emissions, 1990–2006

Figure 13. U.S. and Canadian VOC Emissions, 1990–2006
Source: EPA and Environment Canada, 2008

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