| For the air pollutant | You must meet this emissions limit | With these units (7 percent oxygen, dry basis)
 | Using this averaging time 
a
 | And determining compliance using this method 
b | 
|---|
| HMIWI size | 
|---|
| Small rural | Small | Medium | Large | 
|---|
| Particulate matter | 87 (0.038) | 66 (0.029) | 46 (0.020) 
c 34 (0.015) 
d
 | 25 (0.011) | Milligrams per dry standard cubic meter (grains per dry standard cubic foot) | 3-run average (1-hour minimum sample time per run) | EPA Reference Method 5 of appendix A-3 of part 60, or EPA Reference Method M 26A or 29 of appendix A-8 of part 60 | 
| Carbon monoxide | 20 | 20 | 5.5 | 11 | Parts per million by volume | 3-run average (1-hour minimum sample time per run) | EPA Reference Method 10 or 10B of appendix A-4 of part 60 | 
| Dioxins/furans | 240 (100) or 5.1 (2.2) | 16 (7.0) or 0.013 (0.0057) | 0.85 (0.37) or 0.020 (0.0087) | 9.3 (4.1) or 0.054 (0.024) | Nanograms per dry standard cubic meter total dioxins/furans (grains per billion dry standard cubic feet) or nanograms per dry standard cubic meter TEQ (grains per billion dry standard cubic feet) | 3-run average (4-hour minimum sample time per run) | EPA Reference Method 23 of appendix A-7 of part 60 | 
| Hydrogen chloride | 810 | 44 
c 15 
d
 | 7.7 | 6.6 | Parts per million by volume | 3-run average (1-hour minimum sample time per run) | EPA Reference Method 26 or 26A of appendix A-8 of part 60 | 
| Sulfur dioxide | 55 | 4.2 | 4.2 | 9.0 | Parts per million by volume | 3-run average (1-hour minimum sample time per run) | EPA Reference Method 6 or 6C of appendix A-4 of part 60 | 
| Nitrogen oxides | 130 | 190 | 190 | 140 | Parts per million by volume | 3-run average (1-hour minimum sample time per run) | EPA Reference Method 7 or 7E of appendix A-4 of part 60 | 
| Lead | 0.50 (0.22) | 0.31 (0.14) | 0.018 (0.0079) | 0.036 (0.016) | Milligrams per dry standard cubic meter (grains per thousand dry standard cubic feet) | 3-run average (1-hour minimum sample time per run) | EPA Reference Method 29 of appendix A-8 of part 60 | 
| Cadmium | 0.11 (0.048) | 0.017 (0.0074) | 0.013 (0.0057) | 0.0092 (0.0040) | Milligrams per dry standard cubic meter (grains per thousand dry standard cubic feet) | 3-run average (1-hour minimum sample time per run) | EPA Reference Method 29 of appendix A-8 of part 60 | 
| Mercury | 0.051 (0.0022) | 0.014 (0.0061) | 0.025 (0.011) | 0.018 (0.0079) | Milligrams per dry standard cubic meter (grains per thousand dry standard cubic feet) | 3-run average (1-hour minimum sample time per run) | EPA Reference Method 29 of appendix A-8 of part 60 |