(1) A 70 per cent cut in hydrocarbon emissions

(2) The squad checks the autorickshaw for carbon monoxide and hydrocarbon emissions.

(3) The North Sea is a source of hydrocarbon

(4) This catalyst is responsible for converting carbon monoxide and the other hydrocarbons into carbon dioxide.

(5) Derived chiefly from petroleum and coal tar, aromatic hydrocarbons tend to be reactive.

(6) Nitrogen oxides can react with hydrocarbons to yield nitric acid, a primary ingredient in acid rain.

(7) Biodiesel reduces emissions such as carbon monoxide, unburned hydrocarbons and particulate matter.