• Analysed stations:
CJ-1 (latitude: 46.78 , longitude: 23.62 , altitude: 336.00)CJ-3 (latitude: 46.77 , longitude: 23.55 , altitude: 346.00) 

  • Nitrogen Dioxide (NO2) Analysis:

Before the quarantine, there can be noticed approximately the same quantity of NO2 in the statistics from 2019 and the ones in 2020. After COVID-19 state of emergency starting 16th of March, the CJ-1 station registered a visible decrease in the NO2 emissions. At the end of the quarantine, emissions began to grow and be as high as they were before. On the 15th of September the emissions had an unbelievable drop which was caused by the increasing cases of COVID-19. Because of that, Cluj started to be the second county with the most cases in Romania and the quarantine was instituted again in November.

  • Carbon Monoxide (CO) Analysis:

As it is shown in the chart, there haven’t been any differences between the CO emissions from 2019 and 2020. They were as low as they used to be and the quarantine didn’t affect them.

  • Sulfur Dioxide (SO2) Analysis:

As the quarantine was introduced at the beginning of Spring, there has been a small rise in SO2 emissions. Those statistics have been maintained until late September. Then, the cases in Cluj increased a lot and the SO2 emissions dropped even lower than they used to be at the beginning of the year. In November, quarantine was established again, following an immediate decrease of the emissions in December compared to the year 2019.

  • Conclusion:

As the charts reveal, the quarantine period has changed the NO2 and SO2 emissions a lot, without changing the CO emissions(because they were already at their minimum). With that being said, the measurements show that the atmospheric pollution had an outstanding decrease in Cluj, a county located in northwest Romania. This decrease is helpful in a city like Cluj (where stations CJ-1 and CJ-3 are located) where, because of its crowded streets and the airport situated there, the high atmospheric pollution is usually a problem.