# Multimedia 

Multimedia 

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Unintended Consequences • May 8, 2025 

# PM2.5 and Decentralizing Pollution Standards 

One of the hottest debated topics in environmental pollution policy is PM2.5, particulate matter that is so small it can bypass your respiratory system’s filters and enter your bloodstream. Everyone agrees that it’s a potential problem, but Paul and Peter discuss why a single national standard for PM2.5 might be an expensive mistake that actually hurts public health by misallocating attention and resources.

[![Creative Commons License](/build/cato_2020/images/creative-commons.svg)](http://creativecommons.org/licenses/by-nc-sa/4.0/) 
This work is licensed under a [Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License](https://creativecommons.org/licenses/by-nc-sa/4.0/). 

##### Featuring 

[![Paul Matzko](/sites/cato.org/files/styles/author_picture/public/2021-01/Paul%20Matzko.jpg?itok=CSzwMD2U)](/people/paul-matzko) 

##### [Paul Matzko](/people/paul-matzko)

Adjunct Scholar, Cato Institute

[![Peter Van Doren](/sites/cato.org/files/styles/author_picture/public/2021-01/Peter%20Van%20Doren.jpg?itok=H1lphT-7)](/people/peter-van-doren) 

##### [Peter Van Doren](/people/peter-van-doren)

Senior Fellow and Editor of *Regulation*

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](mailto:pvandoren@cato.org)