as distance to a city decreases , the amount of light pollution will increase
large_cities has pollution_problems level_of_pollution is geographical_quantity. car has headlights_to_increase_visibility large_cities has traffic_problems cities is centers_of_world_power. smog_in_cities is increasing_health_hazard. pollution is danger_to_environment. city_of_los_angeles has air_pollution pollution_abatement is decrease. air_pollution is big_problem_around_major_cities.