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Visit Petjavity.co.uk for full details. For Scientific American Science Quickly, I'm Kendra Pira Lewis, in for Rachel Feltman.

You're listening to our weekly science news roundup.

First up, earlier this month, the U.S. Environmental Protection Agency published a new rule

signaling a major change to the way it counts for the impact of certain air pollutants on human health.

Many health experts say the shift will likely lead to increased air pollution and worse health outcomes.

Andrea Thompson, Siam's senior editor for Life Sciences, is here to give us a clearer understanding

of what the agency is doing and what that means for the air we all breathe.

Hi, Andrea.

Thanks for joining us today.

Thanks for having me.

So my understanding is that in general, the EPA uses a type of cost-benefit analysis to understand the impact of an environmental regulation.

Can you talk a bit about how prior to this rule change, the EPA measured these costs and benefits?

Yeah, so in general, the science for how you sort of calculate how much a regulation will cost,

so the economic benefit you'll get from it

has been pretty well established over several decades.

...