Smoke can be black, blue, white, yellow or brown in appearance. Black smoke is mainly
comprised of carbon particulates (soot). Blue smoke indicates the presence of the products
of the incomplete combustion of the fuel or lubricating oil. White smoke is usually condensed
water vapour. Yellow smoke is caused by NO
x
emissions. When the exhaust gas is cooled
significantly prior to discharge to the atmosphere, the condensed NO
2
component can have
a brown appearance.
13.2 Marine exhaust emissions legislation
13.2.1 International Maritime Organization (IMO)
The increasing concern over the air pollution has resulted in the introduction of exhaust
emission controls to the marine industry. To avoid the growth of uncoordinated regulations,
the IMO (International Maritime Organization) has developed the Annex VI of MARPOL 73/78,
which represents the first set of regulations on the marine exhaust emissions.
The IMO Tier 3 NOx emission standard will enter into force from year 2016. It will by then apply
for new marine diesel engines that:
● Are > 130 kW
● Installed in ships which keel laying date is 1.1.2016 or later
● Operating inside the North American ECA and the US Caribbean Sea ECA
From 1.1.2021 onwards Baltic sea and North sea will be included in to IMO Tier 3 NOx
requirements.
13.2.2 Other Legislations
There are also other local legislations in force in particular regions.
13-2 Wärtsilä 46F Product Guide - a19 - 1 December 2017
Wärtsilä 46F Product Guide13. Exhaust Emissions
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