The biggest problem facing the nation’s most populous cities is the pollution problem that is plaguing their neighborhoods, according to a new report from Axios.
The nation’s 10 largest metros have been cleaning up their environmental footprints to the tune of nearly $7.5 trillion since 2015.
The top five cleanest cities, according the report:San Francisco, which has been spending billions on new parks and public art to fight climate change, is the clear leader in clean-up efforts.
The Bay Area, which boasts the second-largest economy in the country and the third-largest in the world, is also in a great spot in terms of cleaning-up costs.
Its $2.9 trillion in clean air, land and water is the third most in the nation, and it’s second only to Chicago in terms, Axios reports.
New York City, home to one of the largest concentration of public housing complexes in the U.S., is in the middle of its first full year of clean air enforcement.
And it has made great strides in cleaning up its air pollution in the last year, as well.
The study found that the average cost per person for cleaning up a residential area has been reduced by more than half since 2015, as the number of public works projects has grown to nearly 9 million, from around 5 million.
“It’s the cleanest city in the US,” said Kevin Fagan, a spokesman for the nonprofit Clean Air Task Force.
“The air is cleaner than ever.
The public works is more efficient, the quality of the air is better.”
The study comes as Trump administration officials continue to push for federal support for the coal industry.
The Trump administration has been pushing for coal mines to be shut down as part of a deal with the coal lobby to save the environment.
The Clean Air Act prohibits coal mining on federal land, which Trump has previously said would be the case if he were president.
Trump has also promised to reduce the use of fossil fuels in transportation, which the report notes has been one of his main campaign promises.
The White House has also said that it would eliminate the Environmental Protection Agency’s (EPA) regulations that were intended to reduce air pollution.