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- From: apm@hpopd.pwd.hp.com (Andrew Merritt)
- Date: Wed, 23 Dec 1992 14:04:00 GMT
- Subject: Re: Is there hope (for car drivers) ?
- Message-ID: <47900002@hpopd.pwd.hp.com>
- Organization: Hewlett-Packard, CCSY Messaging Centre, UK.
- Path: sparky!uunet!gatech!rpi!think.com!spool.mu.edu!sdd.hp.com!col.hp.com!news.dtc.hp.com!hpscit.sc.hp.com!hplextra!otter.hpl.hp.com!hpopd!apm
- Newsgroups: rec.bicycles.misc
- References: <1992Dec23.115139.6745@osf.org>
- Lines: 28
-
- david@postman.gr.osf.org (David George) writes:
- >Now the big problem with cycling around here is pollution, 60% of it caused
- >by motorcars. Catalysors and Lead Free petrol are not that common either.
- >Anyone making the jump from car driving to cycling is immediately faced with
- >breathing huge quantities of toxic air. Now I'm planning on moving as I'm seem
- >to have developed a whole range of pollution related illnesses, so what hope
- >is there ?
-
- What makes you think the car drivers are not also breathing in the fumes?
- As discussed recently (in r.b.soc, I think; I think the original
- measurements were by Friends of the Earth in the UK), the exposure of car
- drivers to gases from exhausts is generally higher than for cyclists or
- pedestrians, since there is a very steep concentration gradient away from
- the middle of the road. The point of highest concentration is (if I
- remember accurately) near ground level, at the middle of a lane, roughly
- where the air intake (for passengers) on most cars is. You don't perceive
- the fumes so much in a car since the rate of change of concentration of any
- particularly smelly component is less than when you are cycling due to the
- buffering effect of the air system in the car. (The nose detects a change
- in the composition of the air it is breathing, not the absolute
- composition).
-
- The only complicating factor is that you might be breathing more deeply when
- exercising, and potentially take in more pollutants that way, though I think
- this was unlikely to outweigh the benefits of being away from the middle of
- the road, and higher up.
-
- Andrew
-