Air pollution is a major problem in most cities. 60 percent of the pollution in the Los Angeles air basin is attributable to the automobile. Tougher emissions standards for automobiles have helped to keep the air breathable in Los Angeles, however more and more vehicles continue to be introduced to the Los Angeles air basin. As ICE vehicles age, their emissions equipment wears and breaks down. The worst polluters are often 1980's vehicles with broken or missing emissions equipment.
Petroleum based fuel is a finite resource.
Short trips in an ICE vehicle produce relatively more pollution than long trips. Short trips also wear the components of an ICE vehicle more than longer ones. The transportation needs of urban dwellers. 90 percent of Los Angeles commuters travel 74 or fewer miles per day to and from work. 50 percent of Los Angeles commuters travel 30 or fewer miles per day.