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01-20-2007, 05:44 PM

In article <0d65r2dmrbjhba5tgn74igbmot2u3dtoge@4ax.com>,
Chris Neary <diabloridr@tcsn.net> wrote:

> >> In th e U.S. at least, it's very practical to estimate what
> >> portion of the overall pollution is from that 1978 Chevy Caprice.
> >
> >Really? Please demonstrate.
>
> Here's a report generated from 1999 data for Franklin County, Ohio,
> note the section on "Mobile Sources":
> http://www.scorecard.org/env-release...s_county_code=
> 39049#em issions_summary
>
> Currently, there are just over 1 million motor vehicles in Franklin
> County (Source: http://www.co.franklin.oh.us/fc/content/funFacts.cfm)
>
> So our 1978 Chevy Caprice with Franklin County tags is responsible
> for roughly 0.3 tons of CO, 0.06 tons NO2, etc. Assumptions made:
>
> * Model discounts other mobile sources such as aircraft or off-road
> vehicles, thereby overestimating the contribution from the Caprice
>
> * Model assumes the Caprice creates pollution at the average rate for
> motor vehicles, thereby underestimating the contribution from the
> Caprice
>
> * Model assumes the Caprice is driven the average miles/year for the
> all motor vehicles, which may over or underestimate the contribution
> from the Caprice.
>
> * Model is based on 1999 pollution data, which may over or
> underestimate the contribution from the Caprice
>
> You get the idea.

Yes. It can't be done.

01-20-2007, 05:44 PM	#110 (permalink)
Tim McNamara Guest Posts: n/a	Re: OT Interesting video In article <0d65r2dmrbjhba5tgn74igbmot2u3dtoge@4ax.com>, Chris Neary <diabloridr@tcsn.net> wrote: > >> In th e U.S. at least, it's very practical to estimate what > >> portion of the overall pollution is from that 1978 Chevy Caprice. > > > >Really? Please demonstrate. > > Here's a report generated from 1999 data for Franklin County, Ohio, > note the section on "Mobile Sources": > http://www.scorecard.org/env-release...s_county_code= > 39049#em issions_summary > > Currently, there are just over 1 million motor vehicles in Franklin > County (Source: http://www.co.franklin.oh.us/fc/content/funFacts.cfm) > > So our 1978 Chevy Caprice with Franklin County tags is responsible > for roughly 0.3 tons of CO, 0.06 tons NO2, etc. Assumptions made: > > * Model discounts other mobile sources such as aircraft or off-road > vehicles, thereby overestimating the contribution from the Caprice > > * Model assumes the Caprice creates pollution at the average rate for > motor vehicles, thereby underestimating the contribution from the > Caprice > > * Model assumes the Caprice is driven the average miles/year for the > all motor vehicles, which may over or underestimate the contribution > from the Caprice. > > * Model is based on 1999 pollution data, which may over or > underestimate the contribution from the Caprice > > You get the idea. Yes. It can't be done.