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https://loongtszwai.com/2018/09/03/%e7%a9%ba%e6%b0%a3%e8%b3%aa%e7%b4%a024%e5%b0%8f%e6%99%82%e7%9b%a3%e5%af%9f-%e8%a5%bf%e7%87%9f%e7%9b%a4/
空氣質素24小時監察 - 西營盤 (Real-time Air Quality Monitoring at HK Sai Ying Pun)