EntityQ18196395· pop 8· linked from 16 articlesrolling coalSign in to savediesel engine modification to emit large amounts of dark exhaust fumesConnectionsHuffPostEntityemission standardEntityNew YorkEntityIllinoisEntityNew JerseyEntityColoradoEntityMassachusettsEntityMarylandEntityUtahEntityConnecticutEntityIdahoEntityHoustonEntityOntarioEntityBritish ColumbiaEntityThe New York TimesEntitycarbon monoxideEntityInternational Standard Serial NumberEntityair pollutionEntityThe Washington PostEntitydiesel engineEntityCategoriesAir pollutionAutomotive terminologyCar crimeEnvironmental crimeEnvironmental skepticismExhaust systemsHazardous motor vehicle activitiesUnited States-centricVehicle modificationWaste of resources