Ingemar

CH4 from the back end of herbivorous animals may be considered a VOC and it is certainly global warming, as well as smelly. Ammonia from pig litter (or a ripe Coulommiers cheese) is MOST decidedly not
a VOC, nor can it ever be: ammonia is NH3 and contains no carbon and is therefore classed as inorganic and also smelly. It may be a VIC! I don't know the details of the atmospheric degradation
chemistry of NH3 or its compounds, other than it has an obviously very short residence time, probably of the order of an hour, so could not reach the stratosphere where it would cause ozone depletion
(unless you fly the pigs in Concorde). Interestingly, yes it could counter the effects of tropospheric ozone generation by photochemical reactions between VOCs and NOx, but I think I'd rather put up
with a few ppt of O3 than the same of NH3. :-)

Brian

"Ingemar Hernefjord (EMW)" wrote:

> So yes, Mike, we must never forget that a large proportion of VOCs can
> be from natural causes.....animal farts...
>
> ....ammonia from pig farms and other animal breeding not to forget.. imagine what tens of millions of those animals generate each hour...latest reports say ammonia is a real O3 killer....//Ingemar
>
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