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out the study of emissions from end users served by the Canadian natural gas industry. Data from the Radian report did not include separate figures for nitrous oxide (N20). This has been imputed at 1.053% of NOx. The 1.053% is the average of the figure used by Marbek to report N2O from end use equipment, and is consistent with statements from Environment Canada that N2O emissions are about 1% of NO emissions. Because NOx emissions themselves are less than one-quarter of 1 % of CO2 emissions from the industry (in absolute numbers), the impact of removing N20 from the NOx figures, would be very small. For this report, this change has not been made to the figures supplied by Radian. Figures from the Radian report indicate that the 1990 figures for emissions from the Canadian natural gas industry were 8 to 21% higher than previously reported. The revised figures are comparable to government estimates for 1990 emissions from natural gas. As can be observed in Table 10, the results of the Radian study show increases in emissions from the industry for 1990 compared to the 1994 study for the same baseline year. This revised baseline data has a higher degree of confidence in the accuracy of the data presented, since the 1995 studies were more comprehensive than the earlier study, involving more companies directly and incorporating up-to-date data, where possible, on the full range of equipment used within the industry. The industry recognizes that some subjects of the 1996 study require further investigation and updating, particularly with regard to the upstream data collection. Action is being takcn in 1997 by the Canadian Association of Petroleum Producers and Environment Canada to examine emissions from the upstream industry. CGA is cooperating with the principals in this activity. The results for the upstream sectors, as shown in this report, will be adjusted in the light of new data obtained from this 1997 work. As the results of company action plans under the Voluntary Challenge and Registry start to become apparent over the next few years, it is planned to carry out another comprehensive inventory to show emissions results for 2000. Revised figures from the 1996 study also indicate that 1990 methane emissions were 1.36% of marketable production. The comparable US figures for 1992 was 1.68%. As indicated in the US study, future increases in volumes of natural gas to meet demand will result in comparatively lower emission rates, as new equipment is brought into service throughout the industry. Table 10 Canadian Natural Gas IndustryEstimated Air Emissions — 1990Showing 1995 updated and original figures from 1994 study Kt/yr1995 Study for 1990
'CGA Gas Facts 1997 - CGA Forecast of Domestic Demand 1996 — 2010'FromTables4, 5 and6 EPA/GRI news release, February 1997 CCME-EPC/TRE-31E NOx VOC Management Plan, November 1990 6 EPS 5/AP/4 Dec. 1992, Environment Canada |
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