“…As a result, they determined that these measures taken during the pandemic period had positive effects on air quality. Ulutas et al [ 26 ] used principal components analysis and regression model to investigate the effects of air pollution indicators and metrology parameters on the number of Covid-19 cases in Western Anatolia and Western Black Sea region of Turkey. As a result of analysis, they found that wind speed, SO 2 , CO, NOX and O 3 concentrations did not affect the number of new Covid-19 cases in the Western Black Sea Region, while wind speed, SO 2 , CO, NOX, and O 3 concentrations were effective on the number of new cases in Western Anatolia.…”