- Analysed stations:
| SM-1 (latitude: 47.80 , longitude: 22.88 , altitude: 125.00) | SM-2 (latitude: 47.69 , longitude: 22.46, altitude:129.00 ) |
 |  |
- Nitrogen Dioxide (NO2) Analysis:
From January 1st to March 16th, before the first quarantine of 2020, the quantity of NO2 emissions in the air (orange line in the graph below) was approximately the same as in 2019 (blue line in the graph). After the COVID-19 state of emergency began on the 16th of March, the values of NO2 emissions in 2020 (orange line) were lower than the previous year. During the second quarantine (19 November – 02 December), the amount of NO2 in 2020 is basically the same as in 2019. In total, during the two quarantines, the amount of NO2 from 2019 decreased by approximately 20 percent in 2020. Between the two quarantines in 2020, the amount of NO2 in the air increased visibly compared to the previous year.
- Carbon Monoxide (CO) Analysis:
As shown in the graph below, there isn’t any visible difference between the two years referencing the amount of CO in the air, the emissions remained as low in 2020 during the quarantine as in 2019.
- Sulfur Dioxide (SO2) Analysis:
At the beginning of 2020, the SO2 emissions were a lot higher than in 2019, but as soon as the COVID-19 pandemic started, they dropped and remained lower even after the end of the first quarantine. They slowly went up and the amount of SO2 in the air between the quarantines in 2020 is the same during the same time in 2019, but suddenly went down when the quarantine was established again at the end of November.
- Conclusion:
As shown in the graph, the measures taken for the COVID-19 pandemic influenced quite a lot the NO2 and the SO2 emissions, but didn’t really change the CO ones, as they were already at their lowest.