1. A system for determining the source of an air pollutant comprising: a network for receiving pollution data on at least one air pollutant from a plurality of stationary motor vehicles at different air quality measuring locations, wherein said pollution data is provided by a plurality of sensors integrated into the stationary motor vehicles, wherein said plurality of sensors include at least one pollution sensor that is integrated with a GPS system of the motor vehicle; a motion control module that controls said plurality of sensors to stop taking readings when said stationary motor vehicles are moving; and a pollutant source localization device including at least one hardware processor that is configured to produce an air pollution model using a partial differential equation (PDE) describing at least one of diffusion and advection of gasses, wherein integrating the pollution data into the air pollution model provides an origin of a pollutant source for the at least one air pollutant, wherein the PDE comprises: 
 ∂ C/∂t+u∂C/∂x+v∂C/∂y+w∂C/∂z=K _ x (∂^2 C )/ ∂ x ^ 2+ K _ y (∂^2 C )/ ∂ y ^ 2+ K _ Z (∂^2 C )/ ∂ x ^ 2 wherein C is a scalar concentration field, x, y, z are space dimensions, t is a time dimension, u, v and w are wind speed velocities in x-, y- and z-directions respectively, and Kx, Ky, Kz are diffusion coefficients.