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This paper describes the daily concentrations of trace metals and ionic constituents in the aerosol of Beijing, China from March 2001 to August 2003. Daily PM₁₀ concentrations were also measured from September 2001 to August 2003. The daily average PM₁₀ concentration at Beijing, China from September 2001 to August 2003 was 171±117 μg m⁻³ (n=673), which is 5-fold higher than at Yokohama, Japan. Trace metal concentrations were analyzed by using inductively coupled plasma mass spectrometry equipped with a laser ablation sample introduction (LA/ICP-MS), which is a rapid and simultaneous method for multi-element analysis. The daily average metal concentrations in TSP in Beijing from March 2001 to August 2003 were: Al: 3.5±2.4 (n=727), Ti: 0.47±0.35 (n=720), V: 0.013±0.010 (n=716), Cr: 0.019±0.015 (n=618), Mn: 0.24±0.16 (n=730), Fe: 5.5±3.9 (n=728), Co: 0.0046±0.0055 (n=629), Ni: 0.022±0 …