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![washingtonpost Avatar](https://lunarcrush.com/gi/w:24/cr:twitter::2467791.png) The Washington Post [@washingtonpost](/creator/twitter/washingtonpost) on x 19.8M followers
Created: 2025-07-14 15:00:37 UTC

America’s national parks are wildly popular. Last year, they had more than XXX million visits, a number close to the entire population of the United States. 

But how clean or dirty is the air in the parks?

![](https://pbs.twimg.com/card_img/1944703372793110529/Lweavu-n?format=jpg&name=800x419)

XXXXXX engagements

![Engagements Line Chart](https://lunarcrush.com/gi/w:600/p:tweet::1944774037504213073/c:line.svg)

**Related Topics**
[united states](/topic/united-states)

[Post Link](https://x.com/washingtonpost/status/1944774037504213073)