Michael Tobis wrote:

> Aerosols are dominated by low-tech burning of fuels for heat, and by 
> cheap, primitive factories and motors.

Interestingly, I just saw a presentation yesterday indicating that 
burning of agricultural waste (straw) is a significant source of ozone 
and black carbon in China (at least, this source appeared to be 
responsible for large peaks, although in the annual average it might not 
be so important).

James


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