The Pittsburgh Port Commission will combine the EPA grant with another $1.97m from its own account and three participating private companies, Campbell Transportation Company, Consol Energy and River Salvage, to spend more than $3m to repower the four vessels with cleaner burning engines.

Each year, the engines are expected to eliminate over 112 tons of nitrous oxide, 15 tons of carbon monoxide, five tons of particulate matter and two tons of hydrocarbons from the local air, therby addressing health issues including asthma attacks and other respiratory ailments.

Shawn Garvin, regional administrator of EPA, Mid-Atlantic, said: “Putting clean diesel engines in these hard-working marine vessels will bring cleaner, healthier air for communities along the Port’s 200-miles of navigable waterways.

“EPA is pleased to support the Port of Pittsburgh in sustaining its operations while doing what’s necessary to protect people’s health and the environment.”