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E-M:/ Science News Online (3-27-99) China's air pollution chokes crop growth



Folks,
 
Here is a story and some citations for damage to crops in China from ozone.  Michigan's ozone concentrations seem to be hovering around 90 - 110 on those bad air days.  This article mentions ozone concentrations of 60 ppm as being harmful to crops. 

 http://www.sciencenews.org/sn_arc99/3_27_99/fob4.htm

Science