RESUMEN
<p><b>OBJECTIVE</b>To explore the status of clenbuterol pollution in swine products in Beijing city in 2002.</p><p><b>METHODS</b>European Union method (EUR 15127-EN Cy2.3) was adopted to examine the samples. Samples were screened by enzyme-linked immunosorbent assay (ELISA) and confirmed by GC-MS. Detected limit of the method was 0.5 micro g/kg. Samples, including lung, liver, pork, kidney and urine of swine, were collected from slaughterhouses, refrigeratories and markets in 11 districts of Beijing.</p><p><b>RESULTS</b>The results indicated that 185 out of 1 379 samples were positive with an annual positive rate of 13.4%. The highest was 15.7% in lung of swine, followed by urine 15.2% and pork liver 14.0%.</p><p><b>CONCLUSION</b>Rates of detection had decreased from 30.0% to 2.7% during 2002.</p>