ABOUT THE LIST Information on The List was supplied by individual companies through questionnaires and could not be independently verified by the Pittsburgh Business Times. Only those that responded to our inquiries this year or last year were listed. In case of ties, companies are listed alphabetically. Additional content about listed companies and firms that did not make the list is available online.
Columbia Gas unveils renewable natural gas fleet vehicle
The system, known as NeuFuel, differs from compressed natural gas because it can be used at a lower pressure than CNG.
