[Study on the rates of smoking among the residents of Beijing, from 1997 to 2004].

Objective: This study is to find out the trend of smoking rates among Beijing residents since the implementation of "Rules of Smoking Cessation in Public in Beijing" and to compare the data collected from 1997 and 2001.

Methods: Residents of Beijing, aged above 15 in a family were sampled by stratified sampling, and 4 districts were selected as the study locales.

Results: The over smoking rate of Beijing residents decreased by 7.

[Analysis on Clenbuterol pollution in swine products in Beijing, 2002].

Objective: To explore the status of clenbuterol pollution in swine products in Beijing city in 2002.

Methods: European Union method (EUR 15127-EN Cy2.3) was adopted to examine the samples.