If a tanker truck is running down the road, has an accident and spills its load of propane or diesel fuel or whatever, that is classified as a pollutant, and all kinds of emergency task force measures go into effect, and it's cleaned up.
Si un camion-citerne a un accident sur la route et que sa cargaison de propane ou de diesel se répand sur la chaussée, on jugera qu'il y a eu déversement de polluant, des mesures d'urgence seront prises et le tout sera nettoyé.