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"Air" is something we can't see on a clear day, but clear days are
rare, expecially in certain areas where human activities spew
great quantities of matter, usually from energy sources related to
machines of building, industry.  All industrial activities all
around the world contribute to the whole of the pollution we all
breathe and often enough die from.  Even certain industries
prohibited in the US by "Clean Air" laws, such as the manufacture
of polyurethane in emerging countries of 
Asia and Eastern Europe contribute to  air pollution all over the
world.  Knowing that the large machines used in areas of
California for construction, and for farming are belching forth
noxious pollution that is sickening to people, animals, our water,
and plants, it is incumbent on all to do everything possible to
bring clean air legislation to life.