Google Earth Engine based spatio-temporal analysis of air pollutants before and during the first wave COVID-19 outbreak over Turkey via remote sensing.

In these sites, the ground-based SO 2 concentration has an increasing trend in 2020, while a decreasing trend is observed in 2019, showing that the lockdown restrictions were not effective in decreasing the ground-based SO 2 levels as in the satellite-based results.

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The results of some studies also supported our findings by showing a decreasing trend in AOD in different test sites during the lockdown period ( Ghahremanloo et al., 2020 ; Kanniah et al., 2020 ; Otmani et al., 2020 ).

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