MARPOL, Annex - VI, International Regulations for the Prevention of Air Pollution from Ship

Air pollution is caused from Ships Exhaust which emits Sulphur oxide and Nitrogen oxide.

          It sets limits on sulphur oxide and nitrogen oxide emissions from ship exhaust and prohibits deliberate emissions of ozone depleting substances. 

         Applies to all ships of 400 GRT & More which have to carry International Air Pollution Prevention Certificate for ship constructed after 2005.

Special Area (ECA & SECA) 

Emission Control Area

1- Baltic Sea (SOx) 
2- North Sea (SOx) 
3- North America (SOx, NOx) 
4- U. S. Caribbean Sea (SOx, NOx) 

Emission 

Emission means the release of substances subject to control by this Annex from ships into atmosphere or sea. 

SOx Emission Control Area

SECA control area means an Area where adoption of special mandatory measures for SOx emission from ships. In SECA it is required to prevent, reduce and control air pollution from SOx & it's adverse impact on land and sea areas. 

The Baltic Sea and North Sea are designated as SECAs. 

Discharge Conditions:-

NOx prohibited for Diesel Engine with output more than 130 KW

FOR NEW ENGINE :-

TIER –I (1-JAN-2000)	TIER –II (1-JAN-2011)	TIER –III (1-JAN-2016)	RPM
17.0 g/Kw.H	14.4 g/Kw.H	3.4 g/Kw.H	n < 130
45n(-0.2) g/Kw.H	44n(-0.23) g/Kw.H	09n(-0.2) g/Kw.H	130<n<2000
9.8 g/Kw.H	7.7 g/Kw.H	2.0 g/Kw.H	n>2000

 # g/Kw.H = Total weight Cycle Emission

 #  n = Engines Rated Speed (rpm)

SOx in ECA/SECA Area Limita :- 

OUTSIDE SECA
DATE	QUANTITY
Before 1-Jan.-2012	4.5 % mass/mass
On & After 1-Jan.-2012	3.5 % mass/mass
On & After 1-Jan.-2020	0.5 % mass/mass

 

INSIDE SECA
DATE	QUANTITY
Before 1-July-2010	1.5 % mass/mass
On & After 1-July-2010	1.0 % mass/mass
On & After 1-Jan.-2015	0.10 % mass/mass