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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><div><div><p class=MsoNormal><o:p> </o:p></p><div><p class=MsoNormal>On Sat, Dec 28, 2013 at 10:28 AM, David <<a href="mailto:david@h4c.org" target="_blank">david@h4c.org</a>> wrote:<o:p></o:p></p><div><p class=MsoNormal><br>Jason,<o:p></o:p></p><div><p class=MsoNormal style='margin-bottom:12.0pt'><o:p> </o:p></p><div><p class=MsoNormal>On 12/28/2013 12:57 AM, Jason wrote:<o:p></o:p></p></div><blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'><p class=MsoNormal>PS. I have one aquaintance in New Zealand that is challenging the science around respiratory disease and emissions from wood smoke. He says the link is tenuous and the early bogus studies keep getting repeated and used as justification to ban wood stoves. <o:p></o:p></p></blockquote><p class=MsoNormal><o:p> </o:p></p></div><p class=MsoNormal>Water is necessary for life and too much can drown you. Similarly with some things, a little can be of benefit. I recall a study of woodcutters that showed they had increased resistance to colds, and this was attributed to intermittent exposure to wood smoke. On the other hand, the WHO says that 1.6 million people die every year from exposure to indoor air pollution, i.e. also (for the most part) wood smoke. (Coal smoke is far more deadly.) The epidemiology is pretty well established.<br><br>The term of art is hormesis, for which wikipedia offers the definition:<o:p></o:p></p><p class=MsoNormal>Hormesis is the generally favorable biological response to low exposures to toxins and other stressors. A pollutant or toxin showing hormesis thus has the opposite effect in small doses as in large doses. ...<o:p></o:p></p><blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'><p class=MsoNormal><a href="http://en.wikipedia.org/wiki/Hormesis" target="_blank">http://en.wikipedia.org/wiki/Hormesis</a> <o:p></o:p></p></blockquote><p class=MsoNormal><br>As far as the most common contributors to air pollution, it may end up that airborne particulate matter of a certain size range, particularly where the makeup of the particles includes irritants leading to inflammation, will be seen to be most at fault for negative impacts on health. Not wood smoke, exactly, in other words, but some things found in wood smoke, may well be identified as the key bad actors. That would be my current best guess, where I am solidly grounded in nearly perfect ignorance.<br><br>It may be hard to get around the better safe than sorry approach that many might be inclined to take. The future promises to have more regulation, from almost any point of view.<br><br><br>d.<o:p></o:p></p><div><p class=MsoNormal>-- <o:p></o:p></p><div><p class=MsoNormal><span style='font-size:13.0pt'>David William House</span><o:p></o:p></p><div><p class=MsoNormal style='margin-bottom:12.0pt'><span style='font-size:9.5pt'>"The Complete Biogas Handbook" </span><code><span style='font-size:10.0pt'><a href="http://www.completebiogas.com" target="_blank">www.completebiogas.com</a> </span></code><span style='font-size:9.5pt'><br><em>Vahid Biogas</em> , an alternative energy consultancy </span><code><span style='font-size:10.0pt'><a href="http://www.vahidbiogas.com" target="_blank">www.vahidbiogas.com</a> </span></code><span style='font-size:9.5pt'><o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New"'>"Make no search for water. But find thirst,<br>And water from the very ground will burst." <o:p></o:p></span></p><div><p class=MsoNormal><span style='font-size:8.0pt;font-family:"Courier New"'>(Rumi, a Persian mystic poet, quoted in <em><span style='font-family:"Courier New"'>Delight of Hearts</span></em> , p. 77) <br><br><a href="http://bahai.us/" target="_blank">http://bahai.us/</a><o:p></o:p></span></p></div></div></div></div><p class=MsoNormal style='margin-bottom:12.0pt'><o:p> </o:p></p><div class=MsoNormal align=center style='text-align:center'><hr size=2 width="99%" noshade style='color:#909090' align=center></div><table class=MsoNormalTable border=0 cellspacing=0 cellpadding=0 style='border-collapse:collapse'><tr><td style='padding:0in 11.25pt 0in 6.0pt'><p class=MsoNormal><a href="http://www.avast.com/" target="_blank"><span style='text-decoration:none'><img border=0 id="_x0000_i1026" src="http://static.avast.com/emails/avast-mail-stamp.png"></span></a><o:p></o:p></p></td><td style='padding:.75pt .75pt .75pt .75pt'><p><span style='font-family:"Calibri","sans-serif";color:#3D4D5A'>This email is free from viruses and malware because <a href="http://www.avast.com/" target="_blank">avast! Antivirus</a> protection is active. <o:p></o:p></span></p></td></tr></table><p class=MsoNormal><o:p> </o:p></p></div><p class=MsoNormal style='margin-bottom:12.0pt'><br>_______________________________________________<br>Gasification mailing list<br><br>to Send a Message to the list, use the email address<br><a href="mailto:Gasification@bioenergylists.org">Gasification@bioenergylists.org</a><br><br>to UNSUBSCRIBE or Change your List Settings use the web page<br><a href="http://lists.bioenergylists.org/mailman/listinfo/gasification_lists.bioenergylists.org" target="_blank">http://lists.bioenergylists.org/mailman/listinfo/gasification_lists.bioenergylists.org</a><br><br>for more Gasifiers, News and Information see our web site:<br><a href="http://gasifiers.bioenergylists.org/" target="_blank">http://gasifiers.bioenergylists.org/</a><o:p></o:p></p></div><p class=MsoNormal><o:p> </o:p></p></div></div></div></body></html>