[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.]  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?  XXXXXX engagements  **Related Topics** [united states](/topic/united-states) [Post Link](https://x.com/washingtonpost/status/1944774037504213073)
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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
Related Topics united states
/post/tweet::1944774037504213073