"Shanghai indoor PM2.5 declines by half."

Shanghai's new regulations against smoking cigarettes in public places, launched in March, have proved its feasibility and effectiveness of the new indoor smoke-free policy. Indoor PM2.5 concentrations were examined to measure the effects of the regulations, once prior to the regulations coming into effect and then three months later. The percentage of people smoking in restaurants fell from 39 percent to 11 percent. The average indoor PM2.5 was reduced to 64 micrograms per cubic meter, compared with 105 micrograms per cubic meter before. 

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