OGJ Editorial: Off-road air pollution

By extending air-quality regulation to off-road vehicles and engines, the US Environmental Protection Agency has properly adjusted its aim in the fight against pollution.EPA on Sept. 13 issued a final rule setting standards for emissions of three pollutants from new large industrial spark-ignition engines, recreational vehicles, and large diesel marine engines—all previously unregulated. EPA expects the move by 2020 to have cut total emissions from the affected engines by these amounts: hydrocarbons 72%, oxides of nitrogen (NOx) 80%, and carbon mon- oxide 56%.At present, the affected engines contribute relatively little to estimated mobile-source emissions—hydrocarbons 9%, NOx...

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