1. Chi Mai . Economic and health damage from air pollution. Ministry of Natural Resources and Environment (Vietnam) . Retrieved July 28, 2022 from https://monre.gov.vn/Pages/thiet-hai-ve-kinh-te-va-suc-khoe-do-o-nhiem-khong-khi.aspx Chi Mai. Economic and health damage from air pollution. Ministry of Natural Resources and Environment (Vietnam). Retrieved July 28, 2022 from https://monre.gov.vn/Pages/thiet-hai-ve-kinh-te-va-suc-khoe-do-o-nhiem-khong-khi.aspx
2. Tran Quang . Air pollution kills 307,000 people every year in Europe. November 15, 2021 . Retrieved July 28 , 2022 from https://www.vietnamplus.vn/o-nhiem-khong-khi-cuop-di-sinh-mang-307000-nguoi-moi-nam-o-chau-au/753983.vnp Tran Quang. Air pollution kills 307,000 people every year in Europe. November 15, 2021. Retrieved July 28, 2022 from https://www.vietnamplus.vn/o-nhiem-khong-khi-cuop-di-sinh-mang-307000-nguoi-moi-nam-o-chau-au/753983.vnp
3. Mai Dung . “ Pandemic” myopia. VnExpress newspaper . March 04, 2021. Retrieved July 28, 2022 from https://vnexpress.net/dai-dich-can-thi-4243083.html Mai Dung. “Pandemic” myopia. VnExpress newspaper. March 04, 2021. Retrieved July 28, 2022 from https://vnexpress.net/dai-dich-can-thi-4243083.html
4. Do Hang . Refractive errors in children and prevention measures . May 14, 2020. Retrieved July 28, 2022 from https://soyte.phutho.gov.vn/Chuyen-muc-tin/Chi-tiet-tin/title/2664/ctitle/19 Do Hang. Refractive errors in children and prevention measures. May 14, 2020. Retrieved July 28, 2022 from https://soyte.phutho.gov.vn/Chuyen-muc-tin/Chi-tiet-tin/title/2664/ctitle/19
5. World Health Organization (WHO). More than 90% of the world's children breathe toxic air every day . October 29, 2018. Retrieved July 28, 2022 from https://www.who.int/news/item/29-10-2018-more-than-90-of-the-worlds-children-breathe-toxic-air-every-day World Health Organization (WHO). More than 90% of the world's children breathe toxic air every day. October 29, 2018. Retrieved July 28, 2022 from https://www.who.int/news/item/29-10-2018-more-than-90-of-the-worlds-children-breathe-toxic-air-every-day