Norwegian Cruise Line said it has finished retrofitting a third ship with exhaust scrubbers designed to reduce air pollution and comply with tighter pollution standards.

The five scrubbers developed by Yara Marine Technologies and installed on Norwegian Jewel will cleanse 99% of the sulfur and 85% of the visible particles from exhaust gas emissions, the cruise line said.

Norwegian said the scrubbers were the first to be installed while a ship is in service and the first to use a water membrane filtration unit that removes sulfur from a wastewater stream for later disposal.

The Norwegian Jewel’s retrofitting began in spring 2014 and required more than 100,000 man hours between numerous partner organizations.

The Norwegian Escape and Pride of America already have scrubber technology. The Norwegian Pearl and Norwegian Gem will complete their scrubber installation within the coming weeks. The Norwegian Jade and Norwegian Sun are scheduled for retrofitting in the first and second quarter of 2017, respectively.
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Correction: A previous headline said in error that the Norwegian Jade was retrofitted.

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