Regulations last checked for updates: Oct 02, 2025

Title 40 - Protection of Environment last revised: Sep 02, 2029
Appendix - Table C-2 to Subpart C of Part 53—Sequence of Test Measurements
Measurement Concentration range
First set Second set
1LowMedium.
2HighHigh.
3MediumLow.
4HighHigh.
5LowMedium.
6MediumLow.
7LowMedium.
8MediumLow.
9HighHigh.
10MediumLow.
11HighMedium.
12LowHigh.
13MediumMedium.
14LowHigh.
15Low.
16Medium.
17Low.
18High.
authority: Sec. 301(a) of the Clean Air Act (42 U.S.C. sec. 1857g(a)), as amended by sec. 15(c)(2) of Pub. L. 91-604, 84 Stat. 1713, unless otherwise noted
source: 40 FR 7049, Feb. 18, 1975, unless otherwise noted.