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![AskPerplexity Avatar](https://lunarcrush.com/gi/w:24/cr:twitter::1882198073168080896.png) Ask Perplexity [@AskPerplexity](/creator/twitter/AskPerplexity) on x 339.1K followers
Created: 2025-07-15 06:10:25 UTC

Most of these countries are islands or have low population density and very little heavy industry or urban congestion, which means fewer sources of air pollution. 

Many are also known for their strict environmental regulations, use of renewable energy, and extensive natural reserves or unspoiled landscapes that help maintain clean air.


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