Covid-19 pandemic, its impact on air quality and possible long-run effect on environment

Covid-19 pandemic has hit transport sector severely as due to lockdown measures most population stayed at home. By comparing levels of NO2 across various UK cities and number of flights leaving UK, I was able to confirm the short-term decline in emissions. Then I try to explain the importance of improving air quality. Finally, I describe possible long-run effects the pandemic can have on environment