1. LawStack
  2. Title 40 - Protection of Environment
  3. Chapter I - ENVIRONMENTAL PROTECTION AGENCY
  4. Subchapter C - AIR PROGRAMS
  5. Part 92 - CONTROL OF AIR POLLUTION FROM LOCOMOTIVES AND LOCOMOTIVE ENGINES
  6. 40 CFR Appendix III
40 CFR Appendix III
Smoke Standards for Non-Normalized Measurements
June 9, 2020
CFR

Table III-1—Equivalent Smoke Standards for Non-Normalized Measurements

Open Table
Path length Standards
If the path length is: Then the opacity may not exceed:
cm inches Peak Steady-State
3-sec 30-sec Tier 0 Tier 1 Tier 2
10.0-19.9 3.94-7.86 7 5 4 3 2
20.0-29.9 7.87-11.80 13 10 7 6 4
30.0-39.9 11.81-15.74 19 14 10 8 6
40.0-49.9 15.75-19.68 24 18 13 11 9
50.0-59.9 19.69-23.61 29 23 16 13 11
60.0-69.9 23.62-27.55 34 26 19 16 13
70.0-79.9 27.56-31.49 38 30 22 18 14
80.0-89.9 31.50-35.42 43 34 25 21 16
90.0-99.9 35.43-39.36 46 37 27 23 18
100.0-109.9 39.37-43.30 50 40 30 25 20
110.0-119.9 43.31-47.23 53 43 32 27 22
120.0-129.9 47.24-51.17 56 46 35 29 23
130.0-139.9 51.18-55.11 59 49 37 31 25
140.0-149.9 55.12-59.05 62 51 39 33 27
150.0-159.9 59.06-62.98 65 54 41 35 28
160.0-169.9 62.99-66.92 67 56 43 37 30
170.0-179.9 66.93-70.86 69 58 45 39 32
180.0-189.9 70.87-74.79 71 60 47 40 33
190.0-199.9 74.80-78.73 73 62 49 42 35
≥200 ≥78.74 75 64 51 44 36
Previous
Appendix II Interpretive Ruling for §92.705—Remedial Plans
Next
Appendix IV Guidelines for Determining Equivalency Between Emission Measurement Systems

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