MARPOL Annex VI - NOx Tier II Limit

NOx emission limit for Tier II per MARPOL Annex VI Reg. 13 as a function of rated engine speed - the baseline cap for keel dates ≥ 2011-01-01.

NOxTier IIMARPOL VI

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This calculator requires JavaScript to compute its result. The formula, symbols, and regulatory sources are shown in the Formula section below.

Formula, assumptions, and limits

NOx = \begin{cases} 14.4 \& n < 130 \ 44 n^{-0.23} \& 130 \leq n < 2000 \ 7.7 \& n \geq 2000 \end{cases}

Symbol	Meaning	Unit
$n$	Rated engine speed	rpm

Source: MARPOL Annex VI Reg. 13

NOx emission limit for Tier II per MARPOL Annex VI Reg.