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Summary of risk criteria related to CO measurements, risk categories, and 5 exposure categories |
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| Risk category |
Exposure category |
Risk criteria (all emissions of CO) |
% (N) |
|
|
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| Little or none |
1 |
CO emissions from all appliances < 26 ppm |
69% (409) |
| Low |
2 |
Cooker emissions > 26 ppm Gas fire spilling any CO CO in boiler flue gases (room sealed) > 1000 ppm Boiler spilling any CO Poorly positioned flue terminal and flue gases of boiler > 52 ppm Boiler rated ID (any reason) and flue gases > 108 ppm |
19% (111) |
| Medium |
3 |
Cooker emissions > 52 ppm CO Gas fire spilling > 26 ppm CO Boiler spilling > 26 ppm Poorly positioned flue terminal and flue gases of boiler > 104 ppm |
7% (42) |
| High |
4 |
Cooker emissions > 104 ppm Gas fire spilling > 52 ppm CO Boiler spilling > 52 ppm Poorly positioned flue terminal and flue gases of boiler > 208 ppm |
4% (22) |
| Very High |
5 |
Cooker emissions > 208 ppm Gas fire spilling > 104 ppm CO Boiler spilling > 104 ppm Boiler flue gases (open flued) > 1000 ppm Poorly positioned flue terminal and flue gases of boiler > 416 ppm |
2% (13) |
|
|
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| Total |
100% (597) |
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Croxford et al. Environmental Health 2008 7:34 doi:10.1186/1476-069X-7-34 |
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