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UNITED NATIONS: NITROGEN DIOXIDE LEVELS FELL BY 70% IN DELHI

UNITED NATIONS: NITROGEN DIOXIDE LEVELS FELL BY 70% IN DELHI

Context

The United Nations reported that the nitrogen dioxide levels in New Delhi have fallen by more than 70% during the lockdown.

Details

Nitrogen Dioxide levels have fallen down by 40%, in Belgium, it fell by 20%, between 19-40% in the USA.

Why is Nitrogen Dioxide harmful?

  • It reduces the air quality and  It depletes the ozone layer (the stratospheric ozone) by combining with ammonia via particulate matter.
  • It also increases human health risks like cancer and other respiratory diseases.
  • It can get converted into nitric acid and causes acid rain.

Ground level Ozone and Nitrogen Dioxide

  • Around 90% of the total ozone is present in the Stratosphere.
  • 10% is found in the troposphere and is less concentrated than that of stratospheric ozone.
  • It 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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