New York state now has tougher emission limits for diesel generators and natural gas-fired engines commonly used to supply back-up power in large buildings like hospitals and offices.
Democratic Gov. Andrew Cuomo's administration says Tuesday that the new air quality standards are intended to reduce emissions of nitrogen oxides and particulates, which are linked to smog and respiratory problems in people.
The rules will cover large generators that produce more than 150 kilowatts in the New York City area and more than 300 kilowatts in the rest of the state.
Generators with emissions higher than the new limits will be required to be upgraded with new air quality control equipment. Certain generators operated by local government agencies will be given extra time to be brought into compliance.