1. A method of determining an air quality, the method comprising: determining, by one or more computer processors, an image to be measured; determining, by one or more computer processors, an air quality model of at least one key area, the at least one key area including a key area associated with the image to be measured; acquiring, by one or more computer processors, a reference clear image corresponding to the image to be measured; and determining, by one or more computer processors, an air quality index to be measured based on an air quality related feature extracted from the image to be measured, the corresponding reference clear image, and the determined air quality model of the key area associated with the image to be measured.