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01-20-2007, 02:42 PM

>> 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...ssions_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.

While some locations are more prone to absorbing pollution from other
regions (the Southern San Joaquin Valley comes to mind) in general the
significant sources of pollution are local.

Chris Neary
diabloridr@tcsn.net

01-20-2007, 02:42 PM	#109 (permalink)
Chris Neary Guest Posts: n/a	Re: OT Interesting video >> 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...ssions_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. While some locations are more prone to absorbing pollution from other regions (the Southern San Joaquin Valley comes to mind) in general the significant sources of pollution are local. Chris Neary diabloridr@tcsn.net