REPUBLIC OF ARMENIA
MINISTRY OF ENVIRONMENT
28.11.2022
The change in the average annual concentrations of nitrogen dioxide in the atmospheric air of the city of Yerevan in 2017-2021

Although the average annual concentration of nitrogen dioxide does not exceed the maximum permissible concentration (MPC) over the past 5 years, there is a tendency to increase the concentration.
In 2021, the average annual concentration of nitrogen dioxide in the atmospheric air of the capital va 0.027 mg / m3.
This figure is bigger:
- Compared to 2017-by 1.7 times,
- Compared to 2018-by 1.5 times,
- Compared to 2019-by 1.7 times,
- Compared to 2020-by 1.2 times.
The maximum daily concentration of nitrogen dioxide in 2021 was observed on August 18 and was 0.910 mg/m3, which is 22.7 times higher than the MPC.
In recent years, the amount of nitrogen oxides emitted into the atmosphere from mobile and stationary sources has been changing in almost the same way.