The U.S. Environmental Protection Agency says its proposal to relax greenhouse gas limits on power plants will cause as many as 1,630 additional premature deaths annually by 2030 from heart and lung disease — an estimate independent experts say may be low.

The projection is contained in a 289-page technical document accompanying the agency's proposal to replace the Obama-era Clean Power Plan that was released Tuesday.

The new rule would give states more leeway to set limits on greenhouse gas emissions from their power sectors — even though, by the agency's own admission, that will result in higher levels of particulate matter and ozone being emitted by coal plants than would have occurred under President Barack Obama's plan. That pollution is linked with respiratory infections, asthma and impaired lung function.