Number concentrations of particulate matters with different diameters(mass medium diameter: 0.03,0.06,0.11,0.17,0.26,0.40,0.65,1.00,1.60,2.50,4.40,6.80 μm) were on-line monitored using an ELPI(electrical low pressure impactor) during 2009 Spring Festival in Jiading District,a suburb area in Shanghai.Several chemical components including 17 elements,10 ions,organic and elemental carbon in particulate matters with different diameters(0.49,0.49—0.95,0.95—1.50,1.50—3.00,3.00—7.20,7.20 μm) were further determined.These particulate matte...