The switch enhances energy efficiency, lowers sulfur oxide emissions and supports cleaner air for consumers and surrounding communities. The new hydrotreating unit is more than just a capacity boost.

He said the office was using its newly purchased 21-passenger ambulance. Sulfur oxide is a heavy, colorless, poisonous gas with a pungent, irritating odor familiar as the smell of a just-struck match.

High concentrations of the emissions in the air can also form other sulfur oxide compounds, which can react with other material in air to form "particulate matter," small particles that can ...