The impact of Nitrogen Oxides concentration decreases in atmosphere Due to Lockdown of COVID-19


Nitrogen Oxides are a family of corrosive and hazardous gases. These gases form when fuel is burned at high temperatures.  Pollution is emitted by automobiles, trucks and various non-road vehicles

(e.g., construction equipment, boats, etc.) as well as industrial sources such as power plants, industrial boilers, cement kilns, and turbines.

Nox Often appears as a brownish gas. It is a strong oxidizing agent and plays a major role in the atmospheric reactions with volatile organic compounds (VOC) that produce ozone (smog) on hot summer days.

Ozone (O3) has damaging effects on human health and environment.

The significant reductions of O3 depend on nitrogen oxides (Nox) and volatile organic compounds. Nox is a major precursor of O3.In this study I analysed data collected from the air pollution control board of the India for some particular places of India during the lockdown due to COVID-19 Corona virus pandemic.

The air quality index and pollutants present in the air like Pm2.5, pm10, CO2, OZONE, NO2 etc measured by the air pollution control board are very different from other days.

This shows that the air quality is being better during this present lockdown situation and impact of  concentration decreases.

The average level of  and  is decreased by 2.765916667, 4.092833333, 6.3305  respectively during this lockdown.


The real time data of continuous ambient air quality, monitoring by Central Pollution Control Board.


Sector-10, Gandhinagar – GPCB centre, Gujrat, India.


The data collected from CPCB site presented by graph, Daily data of   and  which shows the emission level in.


A forecast/prediction of Nitrogen Oxide present in the air can be made though Differential equation in which unknown variable can be expressed as a function of certain number of known variables.

Concentration level of Nitrogen of Oxide can be expressed as

Where, v total =Total volume of air,

Eemm =Total amount of emitted Nitrogen Oxide.

Eexha= Total amount of exhausted Nitrogen Oxide.

C (t) = Concentration level of Nitrogen of Oxide at time . t

Here the emission level is always higher then exhausted level in normal days so in equation (1) we can consider   Eemm < Eexha

Now the solution for equation (1) is.

Where K = Eemm – Eexha > 0

α is integration constant.


Here the equation (2) shows that the concentration level of the Nitrogen Oxide will be increasing exponentially with time whenever the emissions level is higher then the exhaust level.  

Now if we consider the lockdown situation every year for some smaller period them at that time the emission level became a lower than exhaust level so the constant K will became a negative in equation (2) so the concentration will be decreased for that time. 

Hence the yearly strict lockdown for a week or the monthly one lockdown is more beneficial to the current situation of environment.