March 17, 2020 – Air pollution drops during COVID -19 pandemic
November 13, 2019 – Chennai Smog
November 7, 2019 – Schools shut down in Pakistani City
https://www.trtworld.com/asia/schools-shut-in-pakistani-city-amid-high-smog-31187
May 19, 2019 – Carbon Dioxide Levels Reach Highest Point in Human History
May 18, 2019 -Life Goes On Under Cloud Of Smog In Mexico City
https://phys.org/news/2019-05-life-cloud-smog-mexico-city.html