Concerns over toxicity of these compounds (some reports describe biological effects to marine life at a concentration of 1 nanogram per liter) have led to a worldwide ban by the International Maritime Organization.
Zinc oxide | Calcium oxide | Nitrous oxide | Tin oxide | nitrogen oxide | Titanium oxide | Magnesium oxide | Sulfur oxide | Silver-oxide battery | Silicon oxide | Ruthenium oxide | poly(1,4-phenylene oxide) | Nitrous oxide engine | Nitrogen oxide | magnesium oxide | Iron oxide | Exhaled nitric oxide | Cobalt oxide | calcium oxide |