At each time step, agents set up an internal probabilistic representation of the utilities of the two brands of cars based on prior information and on polling their neighbors. They buy a car according to the computed utilities. Meanwhile pollution is changed because of polluting cars emissions and due to spatial diffusion. The presence of pollution in a neighborhodd decreases car utilities locally. The internal representation updating, car choice and pollution processes are iterated in parallel for all agents until an attractor of the dynamics is reached, such as domination of the market by one brand of cars.