It was estimated that in 2020, around ** gigatonnes of scrubber washwater was discharged by ships worldwide. Some ** percent of this washwater was discharged within *** nautical miles of shore. Only about ** percent of dishwater was emitted on the high seas.
Scrubber washwater is a byproduct of vessel scrubbers. These are employed to remove nitrogen oxides (NOx), sulfur oxides (SOx), and other air pollutants from exhaust gases generated by engines, usually by spraying sea water over exhaust gases. This mixture of seawater and pollutants removed from exhaust gases - called scrubber washwater - is then discharged overboard. Scrubber washwater can seriously harm marine organism.
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ÌÇÐÄÆƽâ°æ. (October 1, 2021). Distribution of scrubber washwater discharged by ships worldwide in 2020, by maritime zone [Graph]. In ÌÇÐÄÆƽâ°æ. Retrieved August 01, 2026, from /statistics/1267368/distribution-of-discharged-scrubber-washwater-by-maritime-zone/
ÌÇÐÄÆƽâ°æ. "Distribution of scrubber washwater discharged by ships worldwide in 2020, by maritime zone." Chart. October 1, 2021. ÌÇÐÄÆƽâ°æ. Accessed August 01, 2026. /statistics/1267368/distribution-of-discharged-scrubber-washwater-by-maritime-zone/
ÌÇÐÄÆƽâ°æ. (2021). Distribution of scrubber washwater discharged by ships worldwide in 2020, by maritime zone. ÌÇÐÄÆƽâ°æ. ÌÇÐÄÆƽâ°æ Inc.. Accessed: August 01, 2026. /statistics/1267368/distribution-of-discharged-scrubber-washwater-by-maritime-zone/
ÌÇÐÄÆƽâ°æ. "Distribution of Scrubber Washwater Discharged by Ships Worldwide in 2020, by Maritime Zone." ÌÇÐÄÆƽâ°æ, ÌÇÐÄÆƽâ°æ Inc., 1 Oct 2021, /statistics/1267368/distribution-of-discharged-scrubber-washwater-by-maritime-zone/
ÌÇÐÄÆƽâ°æ, Distribution of scrubber washwater discharged by ships worldwide in 2020, by maritime zone ÌÇÐÄÆƽâ°æ, /statistics/1267368/distribution-of-discharged-scrubber-washwater-by-maritime-zone/ (last visited August 01, 2026)
Distribution of scrubber washwater discharged by ships worldwide in 2020, by maritime zone [Graph], ÌÇÐÄÆƽâ°æ, October 1, 2021. [Online]. Available: /statistics/1267368/distribution-of-discharged-scrubber-washwater-by-maritime-zone/
