The invention discloses a method and equipment for determining air quality. The method comprises the following steps: determining at least a key area; in at least one position of the key area, acquiring a reference clear image, a training image under poor air quality and corresponding practical air quality index; and training an air quality model of the key area according to the reference clear image, the characteristics extracted from the training image and the practical air quality index. By using the method and equipment, the air quality can be determined according to the images.