http://www.independent.co.uk/news/world/asia/bangkok-smog-school-children-indoors-air-quality-pollution-quality-respiratory-health-concerns-a8200656.html
origin - https://www.pipiscrew.com/2018/02/bangkoks-school-children-kept-indoors-as-thai-capital-blanketed-in-smog/ bangkoks-school-children-kept-indoors-as-thai-capital-blanketed-in-smog