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bicyclinginfo.org

Benefits of Walking : Environmental Benefits

Motor vehicles create a substantial amount of air pollution. In fact, transportation is responsible for nearly 80 percent of carbon monoxide and 50 percent of nitrogen oxide emissions in the U.S. Not surprisingly, many metropolitan areas do not meet the air quality standards specified in the 1990 Clean Air Act Amendments. Although individual cars are much cleaner today than they were in earlier years, if total traffic continues to grow, overall air quality will deteriorate. Moreover, cars and trucks burn millions of barrels of oil, a non-renewable energy source, every day.

Pollution Facts:

  •  Motor vehicle emissions represent 31% of total carbon dioxide, 81% of carbon monoxide, and 49% of nitrogen oxides released in the U.S. (The Green Commuter, A Publication of the Clean Air Council)

  •  60% of the pollution created by automobile emissions happens in the first few minutes of operation, before pollution control devices can work effectively. Since "cold starts" create high levels of emissions, shorter car trips are more polluting on a per-mile basis than longer trips.

  •  A short, four-mile round trip by bicycle keeps about 15 pounds of pollutants out of the air we breathe. (WorldWatch Institute)

  •  Air pollution contributes to the deaths of 60,000 people nationwide. In urban areas with poor air quality, asthma is becoming a more significant health concern. (Harvard University School of Public Health).