March 17, 2020 - Air pollution drops during COVID -19 pandemic

https://www.dailymail.co.uk/sciencetech/article-8121515/Global-air-pollution-levels-plummet-amid-coronavirus-pandemic.html

November 13, 2019 - Chennai Smog

https://timesofindia.indiatimes.com/city/chennai/enveloped-by-smog-city-in-the-red/articleshow/71988553.cms

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

https://www.smithsonianmag.com/smart-news/carbon-dioxide-levels-reach-highest-point-human-history-180972181/

 

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