Essential variables for air quality estimation. - Andrii Shelestov; Andrii Kolotii; Tatiana Borisova; Olena Turos; Gennadi Milinevsky; Igor Gomilko; Tatyana Bulanay; Oleg Fedorov; Leonid Shumilo; Liudmyla Pidgorodetska; Liudmyla Kolos; Arsenii Borysov; et al. (Int. J. Digit. Earth, 2020)