Aspects of the present invention recommend a route. An indication of an origin and a destination is received. Data describing a plurality of navigation routes between the origin and the destination is received. A plurality of pollution score values corresponding to each of the plurality of navigation routes is determined. A cumulative score value is determined for each of the plurality of navigation routes. The data describing the plurality of navigation routes between the origin and the destination and the corresponding plurality of pollution score values and cumulative score values is transmitted.