Exhaust emissions from ships are considered to be a significant source of air pollution, with 18 to 30 percent of all nitrogen oxide and 9 percent of sulphur oxide pollution.
Sulfur | sulfur | Zinc oxide | Calcium oxide | Nitrous oxide | Tin oxide | nitrogen oxide | Titanium oxide | Sulfur dioxide | sulfur dioxide | Magnesium oxide | Sulfur oxide | Sulfur (magazine) | Silver-oxide battery | Silicon oxide | Shown above as a result of a 7 week period where the columns have been allowed to grow algae, cyanobacteria and other bacterial colonies. Of specific interest are the red regions of the middle column, indicative of purple non-sulfur bacteria (e.g. ''Rhodospirillaceae | Ruthenium oxide | poly(1,4-phenylene oxide) | Nitrous oxide engine | Nitrogen oxide | magnesium oxide | Iron oxide | Exhaled nitric oxide | Cobalt oxide | calcium oxide |