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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)

[GUEST ACCESS MODE: Data is scrambled or limited to provide examples. Make requests using your API key to unlock full data. Check https://lunarcrush.ai/auth for authentication information.]

washingtonpost Avatar The Washington Post @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?

XXXXXX engagements

Engagements Line Chart

Related Topics united states

Post Link

post/tweet::1944774037504213073
/post/tweet::1944774037504213073