['Air Programs']
['Air Emissions']
03/22/2023
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(a) The smoke opacity standards in this section apply to all engines subject to emission standards under this part, except for the following engines:
(1) Single-cylinder engines.
(2) Constant-speed engines.
(3) Engines certified to a PM emission standard or FEL of 0.07 g/kW-hr or lower.
(b) Measure smoke opacity as specified in §1039.501(c). Smoke opacity from your engines may not exceed the following standards:
(1) 20 percent during the acceleration mode.
(2) 15 percent during the lugging mode.
(3) 50 percent during the peaks in either the acceleration or lugging modes.
[88 FR 4658, Jan. 24, 2023]
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