New Jersey and 15 other states that want the U.S. Postal Service to buy more electric delivery vehicles are suing to halt purchases of thousands of gas-powered trucks as the agency modernizes its mail delivery fleet.

Three separate lawsuits, filed by 16 states and environmental groups Thursday in New York and California, ask judges to order a more thorough environmental review before the Postal Service moves forward with the next-generation delivery vehicle program.

Plaintiffs contend that purchases of fossil fuel-powered delivery vehicles will cause environmental harm for decades to come.

“Louis DeJoy’s gas-guzzling fleet guarantees decades of pollution with every postcard and package,” said Scott Hochberg, an attorney with the Center for Biological Diversity, referring to the postmaster general.

One lawsuit was filed by the Center for Biological Diversity, Earthjustice, CleanAirNow KC and Sierra Club in San Francisco. Attorneys general from 16 states and the District of Columbia filed another suit in the same venue. Another was filed by the Natural Resources Defense Council and United Auto Workers in New York.

All three of them target the environmental review underpinning the Postal Service's planned purchase of up to 165,000 next-generation delivery vehicles over the next decade.

California Attorney General Rob Bonta said it’s key to stop the process before it’s too late.

“Once this purchase goes through, we’ll be stuck with more than 100,000 new gas-guzzling vehicles on neighborhood streets, serving homes across our state and across the country, for the next 30 years. There won’t be a reset button,” he said.

The Postal Service defended its actions.

“The Postal Service conducted a robust and thorough review and fully complied with all of our obligations under (the National Environmental Policy Act),” spokesperson Kim Frum said Thursday in an email.

The Postal Service contract calls for 10% of the new vehicles to be electric but the Postal Service contends more electric vehicles can be purchased based on financial outlook and strategic considerations.

The percentage of battery-electric vehicles was doubled — to 20% — in the initial $2.98 billion order for 50,000 vehicles.

Environmental advocates contend the Postal Service's environmental review was inadequate and flawed, and that the contract represented a missed opportunity to electrify the fleet and reduce emissions.

The review process “was so rickety and riddled with error that it failed to meet the basic standards of the National Environmental Policy Act,” said Adrian Martinez, senior attorney on Earthjustice's Right to Zero campaign.

The Postal Service is in the process of replacing the ubiquitous delivery trucks that went into service between 1987 and 1994.

The new gasoline-powered vehicles would get 14.7 miles per gallon (23.7 kilometers per gallon) without air conditioning, compared to 8.4 mpg (13.5 kpg) for the older vehicles, the Postal Service said.

All told, the Postal Service’s fleet includes 190,000 local delivery vehicles. More than 141,000 of those are the old models that lack safety features like airbags, anti-lock brakes, and backup cameras.

The new vehicles are taller to make it easier for postal carriers to grab packages and parcels that make up a greater share of volume. They also have improved ergonomics and climate control.

The states that sued are California, Connecticut, Delaware, Illinois, Maine, Maryland, Michigan, New Jersey, New Mexico, New York, North Carolina, Oregon, Pennsylvania, Rhode Island, Vermont, and Washington.

The Bay Area Air Quality Management District in California, District of Columbia and city of New York joined that lawsuit, as well.

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