“…In these studies, airports investigated were located in Europe [15,[26][27][28][29], Asia [13,[30][31][32][33], America [14,34,35], and Australia [8,36,37]. The pollutant emissions from aircraft operations at airport have been studied at a specific airport level [27,35,[38][39][40], on a regional multi-airport scale [13,15,30], nationwide [16,37,41,42], and also globally [9,[43][44][45]. These fruitful papers developed inventories of pollutant emissions at airports, helped people understand emissions better, and laid a solid foundation for the following studies.…”