- Table C-1 to Subpart C of Part 53—Test Concentration Ranges, Number of Measurements Required, and Maximum Discrepancy Specifications
| Pollutant | Concentration range, parts per million (ppm) | Simultaneous measurements required | Maximum
discrepancy specification, parts per million | 1-hour | 24-hour | First set | Second set | First set | Second set | Ozone | Low 0.06 to 0.10 | 5 | 6 | 0.02 | Med. 0.15 to 0.25 | 5 | 6 | 0.03 | High 0.35 to 0.46 | 4 | 6 | 0.04 | Total | 14 | 18 | Carbon monoxide | Low 7 to 11 | 5 | 6 | 1.5 | Med. 20 to 30 | 5 | 6 | 2.0 | High 25 to 45 | 4 | 6 | 3.0 | Total | 14 | 18 | Sulfur dioxide | Low 0.02 to 0.05 | 5 | 6 | 3 | 3 | 0.02 | Med. 0.10 to 0.15 | 5 | 6 | 2 | 3 | 0.03 | High 0.30 to 0.50 | 4 | 6 | 2 | 2 | 0.04 | Total | 14 | 18 | 7 | 8 | Nitrogen dioxide | Low 0.02 to 0.08 | 3 | 3 | 0.02 | Med. 0.10 to 0.20 | 2 | 2 | 0.02 | High 0.25 | 2 | 2 | 0.03 | Total | 7 | 8 |
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