https://www.toppr.com/guides/essays/essay-on-environmental-pollution/
https://eticon.co.id/penyebab-dari-pencemaran-tanah/
https://edition.cnn.com/2020/06/02/world/cleanest-air-intl-scli-scn-climate/index.html
https://edition.cnn.com/2022/03/22/world/air-pollution-2021-iqair-report-climate/index.html
https://www.who.int/health-topics/air-pollution#tab=tab_1