A brief on COVID-19 in an Urban World by the Secretary-General of the United Nations has revealed that the levels of greenhouse gases like Nitrogen dioxide have reduced significantly during the lockdown. Many countries were forced to withdraw their day to day operations, halt the economy, and carry out any possible work remotely. This has had a positive effect on the quality of air in countries like India, China, and The United States of America. It has been observed that the air in the capital state of Delhi had become cleaner by 70%. This can lead to a huge effect on the health of people living or working in Delhi. The Coronavirus directly affects the respiration system of a person and if the air is polluted, it can have a rapid effect on the number of COVID-19 cases in the region. Even Though the levels of harmful gases have reduced drastically, the UN secretary has warned that this could be a temporary effect if strict policies related to controlling air pollution are not in place by the end of this pandemic.