1. A method of determining an air quality in real-time at a location from a mobile terminal image, the method comprising: determining, by one or more computer processors, an image to be measured, wherein the image is received from a user of a mobile terminal with a camera device; 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 of a location 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.