Calculating CO2 from cars

If someone knows a better way to calculate this please post-

Every 1000 cars at a school dropoff produce 4 tons of CO2 and 1 ton of noxious emissions.

Every 1000 commute cars produce 12 tons of CO2 and 3 tons of noxious emissions.

- 21 mpg average CAFE standard

- 12 mils is the average one way commute trip in the bay area. The "average weekday daily VMT" in the Bay Area, was 157,172,000 in 2007, or 80 roundtrips to the moon every day and increasing.

- 20 lbs of CO2 in one gallon of gasoline. One gallon=6lbs produces 19.4 lbs of CO2

- 2.25/1 is the ratio between the Honda Civic hybrid/Prius average and the CAFE average.

- 50% of trips in the morning commute are school related

- 43% of all trips are two miles or less when the engine is most inefficient. This is why we need to account for children landuses in general plans.

Other MTC numbers quoted by car here

The Problem of Energy Use
Association of Bay Area Governments report on the Bay Area GHGs says 50% of CO2 from mostly the private car. (page 17)
and recommendation (including staff)-

Noxious emissions
The EPA monitors 188 air pollutants.
The CA state Air Resource board identify three sources of particulate matter Area, Point, and Mobile; with mobile sources being by far the largest problem. These sources, coming from vehicles, generate two kinds of particles presently measured- PM10 from vehicles, construction sites, unpaved roads, factories, wood burning, and fuel combustion at power plants and in industrial processes and PM2.5 from fuel combustion and combination with other pollutants.
The World Health Organization (2005) has proposed tighter standards to improve public health because “an increasing range of adverse health effects has been linked to air pollution, and at ever-lower concentrations” page 10. However EPA has't gone far enough even with staff's own weak recommendations. Sen. Barbara Boxer (D-Calif.), who heads the Senate Committee on Environment and Public Works, sharply criticized the agency's decision, "Once again, the EPA has rejected the recommendations of its scientific advisors and failed to protect our communities from dangerous air pollution." Lifelong damage is found in 13-year study of 3600 Southland youngsters living within 500 yards of a highway. Major roads like Ralston can be just as toxic.