References:
- https://www.ajudaily.com/view/20191212150133397
- https://qz.com/882158/with-air-pollution-skyrocketing-warsaw-is-severely-hit-by-polands-smog-problem/
- https://unearthed.greenpeace.org/2018/12/07/katowice-cop24-un-climate-change-coal/
- https://time.com/2950261/china-drones-pollution/
- https://www.usnews.com/news/best-countries/south-korea
- https://www.oecdbetterlifeindex.org/topics/environment/
- https://www.theguardian.com/world/2018/may/16/south-koreans-more-worried-about-air-pollution-than-kims-nukes
- https://www.who.int/health-topics/air-pollution#tab=tab_1
- https://timesofindia.indiatimes.com/gadgets-news/watch-korea-gets-its-first-drone-taxi-flying-over-3-cities/articleshow/79432461.cms
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