Hakan, I certainly appreciate that there are many similar studies here,  
so the issue is not whether ultrafiine particles are dangerous, they  
are.

However, the question was originally posed as to whether a forklift on  
biodiesel in a warehouse is better than one on natural gas, I posted  
information that suggested it might be, Keith questioned whether that  
Toy (Harvard) study was as useful in answering the question as we'd  
like, etc.

I do not mean to minimize the proven health risk of ultrafine  
particles, but there are many sources of these in life, and you'd  
probably need to wear a mask and use an electric forklift in a  
warehouse, for the best protection in terms of occupational health  
(long term daily exposure in the warehouse environment).

Indoor air quality, including in the home, is also a serious issue in  
regard to PM10, PM2.5 and ultrafine particles - many say more serious  
than outdoor air quality.

However, I am definitely interested in seeing more studies on this and  
of course especially good ones that may corroborate the findings of Toy  
et al.

Now, as to risk assessment, and the perception of risk, I stand by my  
comments. There are many instances where people believe there is risk  
that is not there, and minimize risk that is present. For a company  
with a legitimate and safe product, it is fair that they be trained and  
understand how "perception is reality", and get government and consumer  
acceptance so they can succeed even though there may be some inital  
"scary sounding" aspect to their product or service that is not  
justified in reality.

That's different from greenwashing, which does occur, of course!

Again, I do not mean to include ultrafine particles in this discussion  
as being something that is not to be taken seriously as a health risk.  
I have had much personal and immediate family experience with the  
health problems related to air quality, and that is what led to my  
interest in this field and to the contribution that biofuels for diesel  
can make to improving the situation. We'll need more than the Toy study  
to point to, though, if it's a comparison of "which is better, natural  
gas or clean diesel/green diesel/biodiesel/SVO, etc.")

Edward Beggs
http://www.biofuels.ca





On Monday, April 12, 2004, at 05:54 PM, Hakan Falk wrote:

>
> Ed,
>
> In the Europe investigations from Switzerland and France, it was also
> estimates of how many fatalities the Ultra fine particles (less than  
> 2.5
> micron) caused per year. The direct fatality figures were around twice  
> the
> number of fatalities caused by road accidents. It is not a subject  
> that can
> be neglected and it is serious. In Switzer land, the fatalities were
> something around 2,000 per year.
>
> Hakan
>
>
> At 21:18 12/04/2004, you wrote:
>> Just on this section on risk assessment, I think this differs from
>> deliberate or subconscious researcher bias, in that there *are* many
>> instances where people fear what ought not be feared, and ignore what
>> they should fear, or consider it to be safe (a good example would be
>> that because its is "natural" versus "synthetic" it's better/safer -
>> that's a pretty common sentiment, but not necessarily true).
>>
>> Mention "PCB's" and people will recoil in fear, even though, IIRC,
>> there are only a few of the many PCB's out there that are *very*
>> harmful, and many more that are not very harmful.
>>
>> I don't think that offering courses to the business sector on this
>> topic is *necessarily* a bad thing or makes the group offering them a
>> bad bunch - it's like teaching technology (or other branches of
>> psychology), it is the intent, and the end use that the student puts
>> the information to that matters.
>>
>> I understand that this sort of thing can be used to "spin-doctor" an
>> environmental "bad idea" into something that sounds ok, but it can  
>> also
>> be used to prevent an unfair, unwarranted public bias that could
>> prevent a perfectly good product/service/company from existing just
>> because it "sounds scary" or was poorly presented.
>>
>> Bottom line: some things sound great, but might be, in all or some
>> circumstances, downright dangerous.
>>
>> e.g. "Local residents make cleaner burning  "biodiesel" on the kitchen
>> stove!"
>>
>> Others sound dangerous, but might very well be virtually harmless (at
>> least on a strictly technical/scientific basis!)
>>
>> e.g. "New dihydrogen monoxide plant, owned by Monsanto, to open
>> immediately next to residential area!!"
>>
>> <http://www.snopes.com/toxins/dhmo.htm>http://www.snopes.com/toxins/ 
>> dhmo.htm
>>
>> It ain't easy being green, nor searching for "the truth"!
>>
>> ;-)
>>
>> Edward Beggs
>>
>> On Monday, April 12, 2004, at 10:28 AM, Neoteric Biofuels Inc wrote:
>>
>>>>> HCRA not only analyses risk but, in conjunction with allied
>>>>> institutions, also runs courses on 'risk communication". "Learn how
>>>>> to more effectively communicate about risk issues with various
>>>>> audiences, and how to incorporate risk communication into the
>>>>> strategic operation of your organization. A combination of expert
>>>>> instruction, class participation, and real-world examples of
>>>>> successes and failures in risk communication will give you an
>>>>> understanding of the theoretical and practical issues involved,"
>>>>> promotional material for a May 2003 seminar stated. The course
>>>>> program Directors were George M. Gray, David P. Ropeik and Ragnar
>>>>> Lšfstedt.
>>>>>
>>>>> Another course scheduled for April 2002, HCRA and their co-hosts
>>>>> promised that those attending the two and a half day long "Risk
>>>>> Communication Challenge" course would "learn the underlying
>>>>> psychology of how people 'decide' what to be afraid of and how
>>>>> afraid to be. You will learn how to select and craft key messages,
>>>>> how to deliver those messages, and how to work with the media to  
>>>>> get
>>>>> your message out".
>
>
>
>
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