On July 28, 2020, the United Nations reported that the nitrogen dioxide levels in New Delhi has fell by more than 70% during the lock down. However, according to the international organization, this could be temporary till the cities re-open.
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The Nitrogen Dioxide levels has fallen down in other countries as well. In China the levels have fell by 40%, in Belgium, it fell by 20%, between 19-40% in USA.
Why is Nitrogen Dioxide harmful?
The Nitrogen Oxides reduce the air quality. It depletes ozone layer (the stratospheric ozone) by combining with ammonia via particulate matter. It also increases human health risks like cancer and other respiratory diseases. The Nitrogen oxides can get converted into nitric acid and causes acid rain. Acid rains are highly harmful as they leech into under ground surfaces contaminating ground water.
Ground level Ozone and Nitrogen Dioxide:
Around 90% of total ozone is present in the Stratosphere. 10% is found in troposphere and is less concentrated than that of stratospheric ozone. The Ground level Ozone is created by the chemical reaction between organic compounds and nitrogen oxides. Since ozone is a greenhouse gas, it contributed to global warming. Thus, it is essential to control nitrogen oxides in the atmosphere.
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