1.IT is a major refining center in North America, with five major erfineries that have the combinedcapacity to process roughly 95 million liters of crude oil per day.
2. this metropolitan area also has a relatively large number of vehicles.with over4.5 million automobiles,vans, and heavy-duty commercial trucks (Purvis,1997) that consume about 13 billion liters of gasoline and 2 billion liters of diesel fuel per year.