The environmental policies of Joe Biden’s administration will save approximately 200,000 Americans’ lives from dangerous pollution in the coming decades and have spurred a surge in clean energy jobs, two independent reports outlining the stakes of the upcoming US presidential election have found.

The first full year of the Inflation Reduction Act, the sprawling climate bill passed by Democratic votes in Congress in 2022, saw nearly 150,000 clean energy jobs added, according to a new report by nonpartisan business group E2.

Nearly 3.5 million people now work in these fields in the US, more than the total number of nurses nationwide, with 1m of these jobs centered in the US south, a region politically dominated by Republicans.

Clean energy jobs grew by 4.5% last year, nearly twice as fast as overall US employment growth, and account for one in 16 new jobs nationally, the report found. New roles in energy efficiency led the way, followed by an increase in jobs in renewable energy, such as wind and solar, electric car manufacturing and battery and electric grid upgrades.

But the future of the IRA, which provides tax credits and grants for new clean energy activity, is a flashpoint in the election campaign, with Donald Trump vowing to “terminate Kamala Harris’s green new scam and rescind all of the unspent funds”.

The former president and Republican nominee has accused Harris, his Democratic opponent, of waging a “war on American energy” and called for an end to incentives encouraging Americans to drive electric cars.

Harris, who has promised in unspecified ways to build upon the IRA, has attacked Trump for “surrendering” on the climate crisis as well as in the US’s attempts to compete with China, the world’s clean energy manufacturing powerhouse.

Bob O’Keefe, executive director of E2, said the IRA has helped lead “an American economic revolution the likes of which we haven’t seen in generations”.

“But we’re just getting started,” Keefe added. “The biggest threats to this unprecedented progress are misguided efforts to repeal or roll back parts of the IRA, despite the law’s clear benefits both to American workers and the communities where they live.”

Should Trump return to the White House, he will need congressional approval to completely repeal the IRA, although his administration could slow down and even claw back funding allocated but not yet released for clean energy projects, such as the $500m pledged for a green overhaul of a steel mill in JD Vance’s home town of Middletown, Ohio.

A new Trump administration would have more discretion, though, over the future of air pollution regulations set by the Environmental Protection Agency (EPA) under Biden. “One of the things that is so bad for us is the environmental agencies, they make it impossible to do anything,” Trump has complained while on the campaign trail.

Any major rollbacks will have a heavy toll upon public health, however, with a new analysis of 16 regulations passed by the EPA since Biden’s term started in 2021 finding that they are on track to save 200,000 lives and prevent more than 100m asthma attacks by 2050.

The analysis, conducted by the Environmental Protection Network, a group founded by retired EPA staff, calculated the public health benefits of the suite of new rules that aim to limit pollution flowing from cars, power plants and oil and gas operations.

Jeremy Symons, a former climate policy adviser at the EPA and a co-author of the report, said the findings were “jaw-dropping”. He added: “The EPA’s accomplishments have been nothing short of lifesaving over the last four years. These are real people who wouldn’t be alive if not for the non-partisan work of the EPA to start doing its job again after the last administration.”

It’s unclear what Trump’s exact plan for the EPA would be should he regain power but he attempted to radically cut the agency’s budget when he was president, only to be rebuffed by Congress, and oversaw the elimination and weakening of a host of pollution rules.

Trump has directly promised oil and gas industry executives a fresh wave of deregulation should he return to the White House, in return for $1bn in campaign contributions.

Project 2025, a conservative blueprint authored by many former Trump officials but disavowed by the Trump campaign, demands the dismantling of parts of the agency, a rollback of environmental rules and a politicization of decision making.

“This would put polluters in charge of air regulations and put millions of Americans at needless risk of cancer, heart disease and asthma,” said Symons.

“Several of the authors of Project 2025 used the years of working at the EPA under Trump as a training ground for more reckless plans should they get their hands on the agency again. This plan would be a wrecking ball to the EPA.”

Asked to comment, the Trump campaign criticized the Biden-Harris administration on inflation and what it called its “war on energy”.

“Kamala Harris cast the tie-breaking vote in the Senate for the misnamed Inflation Reduction Act, which actually created the worst inflation crisis in a generation. She proudly helped Joe Biden implement all of his disastrous policies including his war on American energy that is driving up prices astronomically for American consumers,” said Karoline Leavitt, Trump campaign national press secretary.

“President Trump is the only candidate who will make America energy dominant again, protect our energy jobs, and bring down the cost of living for all Americans,” Leavitt added.

An EPA spokesperson said: “We appreciate the work of the Environmental Protection Network and look forward to reviewing their report. EPA remains committed to protecting public health and the environment by implementing science-based pollution standards that address climate change and improve air quality for all Americans.”