Abstract：Continuous measurements were undertaken of NO, NO2, O3 and meteorological conditions at four monitoring stations at urban area of Langfang, Hebei province from January 2013 to December 2015. During this period, the mean concentrations (×10-9) of NO, NO2, NOx and O3 were 15.10, 23.00, 38.10 and 23.25 respectively. Peak NO concentrations often appear at about 07:00~09:00 in the morning due to increase in traffic emissions and reduction in boundary layer heights. O3 show a single peak at about 15:00~16:00. The mean NO2 photolysis rates (min-1) reach top at 14:00~16:00 and vary with seasons which are 0.128 in spring, 0.398 in summer, 0.315 in autumn and 0.117 in winter. NO-NO2, O3 were fitted well as quadratic polynomial, inverse proportional function of NOxrespectively. NOx and OX concentration of mid-small towns from Jing-Jin-Ji regions were differently affected by local, regional source contribution respectively. The peak regional contribution occurs at 16:00~18:00.
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