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The Environmental Protection Agency is gearing up to significantly tighten air-pollution regulations for the first time under President Trump.

Driving the news: E&E News, citing three sources, is reporting that the agency will announce tighter tailpipe standards for big trucks on Tuesday. An EPA spokesman didn’t respond to E&E News' request for comment.

One level deeper: Tuesday’s announcement is expected to preview an update to rules that set the standards for nitrogen oxides, a pollutant that contributes to smog and poor air quality, E&E News reports. More details:

  • State and local air agencies petitioned the EPA to tighten these standards for big trucks, including semis, in 2016.
  • These standards haven’t been updated since 2001.

The big picture: The primary focus of the EPA under Trump has been to unravel a series of significant regulations put in place by then-President Barack Obama. In most cases, the agency is either working to repeal those rules or replace them with far less stringent versions. This rule is likely to be the exception, not the new norm.

Go deeper

America rebalances its post-Trump news diet

Illustration: Annelise Capossela/Axios

Nearly halfway through President Biden's first 100 days, data shows that Americans are learning to wean themselves off of news — and especially politics.

Why it matters: The departure of former President Trump's once-ubiquitous presence in the news cycle has reoriented the country's attention.

2021 sees a record number of bills targeting trans youth

Illustration: Annelise Capossela/Axios

Republicans in at least 25 states have introduced over 60 bills targeting transgender children — a legislative boom since January that has beaten 2020's total number of anti-trans bills.

Why it matters: LGBTQ advocates say the unprecedented push was catalyzed by backlash to Biden's election and the Supreme Court ruling that workers cannot be fired for being gay or transgender.

Why migrants are fleeing their homes for the U.S.

Illustration: Eniola Odetunde/Axios Photo: Herika Martinez /Getty Images 

Natural disasters in Central America, economic devastation, gang wars, political oppression, and a new administration are all driving the sharp rise in U.S.-Mexico border crossings — a budding crisis for President Biden.

Why it matters: Migration flows are complex and quickly politicized. Biden's policies are likely sending signals that are encouraging the surge — but that's only a small reason it's happening.

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