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https://baraberita.com/pendidikan/sma-negeri-5-balikpapan-peringati-hari-bebas-emisi-2019-bebas-polusi-karbon-monoksida-co/
SMA Negeri 5 Balikpapan Peringati Hari Bebas Emisi 2019, Bebas Polusi Karbon Monoksida (CO)