Table 2 Summary of risk criteria related to CO measurements, risk categories, and 5 exposure categories
Risk category | Exposure category | Risk criteria (all emissions of CO) | % (N) |
|---|---|---|---|
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) |
Total | Â | Â | 100% (597) |