18 February 2010 — The U.S. Environmental Protection Agency is setting standards, set to become effective in 2013, to cut emissions of formaldehyde, benzene, acrolein and other toxic air pollutants from certain stationary diesel engines. EPA estimates more than 900,000 of the engines generate electricity and power equipment.

The limits apply to existing diesel engines meeting certain criteria for age, size and use. Emergency engines used at most residences, hospitals and other institutional facilities, and commercial facilities such as shopping centers are not covered by this rule.

EPA said owners and operators of the largest engines will need to install emissions controls, such as catalysts, to engine exhaust systems. Emergency engines covered by this rule need to comply with operating requirements that limit emissions.

EPA will issue final emissions standards for similar existing stationary engines that burn gasoline, natural gas and landfill gas, known as spark ignition engines, by Aug. 10, 2010.