The city needs to reduce hydrocarbons and nitrogen oxide emissions by a staggering 60 percent just to meet existing Federal health standards for ozone, the main component of urban smog.

His generic catalytic converter, which greatly reduced the amount of carbon monoxide and unburned hydrocarbons in automobile exhausts, was granted U.S. Patent 2,742,437 in 1956.

The re-formulated gasoline helps reduce hydrocarbons, which are emitted by unburned fuel, but not carbon monoxide, a combustion product.

I understand that the presence of more oxygen makes combustion more complete, reducing CO and hydrocarbons.

Though emission control devices have reduced hydrocarbons from automobile engines by 95 percent, cars still contribute 60 percent of the hydrocarbons in urban air.

By 2010, California officials predict, the rules will reduce hydrocarbons by 10 percent and carbon monoxide by 12 percent.

They do need to work on automobiles, they do need to reduce hydrocarbons from any source.

Some sulfate-reducing bacteria can reduce hydrocarbons such as benzene, toluene, ethylbenzene, and xylene, and have been used to clean up contaminated soils.

The legislation was aimed at reducing airborne hydrocarbons in the state by 20 percent.

To reduce hydrocarbons, some refiners have cut the content in their gasoline of a class of chemicals called aromatics.