Temporal And Spatial Variation Of Urban Air Ion Concentration And Environmental Factors In The Relationship,

Air negative-ion is praised as air vitamin, and it is of advantage to man's health. Air negative-ion concentration has been an important index in evaluating cleanness of the area air. The paper took Xuhui district of Shanghai for example, studied the temporal-spatial variety characteristic of air-ion concentration, and the correlativity between air-ion concentration and environmental factors on typical ground in different urban function-area. There were many factors such as air-ion, green-quantity, PM10, solar radiant, temperature, humidity and wind speed of each season in urban garden, and in habitation, and in campus, and in traffic road were observed by the experiment during Aug-2004 to Mar-2006. Further, the daily variety characteristic of air-ion concentration, and seasonal variety characteristic, and annual variety characteristic, and spatial variety characteristic, and correlativity between it and environmental factors were analyzed.It was showed that the air-ion concentration changed obviously on a typical ground during a day. The maximal concentration of small air-ion appeared at 1 PM. and the Min. appeared in traffic fastigium. And maximal concentration of big air-ion appeared at 9 AM. to 13 PM. and the Min. appeared in3 to 4 PM. The results showed that the air-ion concentration changed obviously on a typical ground over a year. The small air-ion concentration was highest in summer, and lowest in winter, and less higher in spring and autumn. The big air-ion concentration in winter and spring was higher than in summer and autumn. It was showed that the annual variety characteristic of air-ion concentration was obvious. The average value in summer and winter of small positive-ion were 440 and 330 respective, so the annual variety was 240; the average value in summer and winter of small negative-ion were 451 and 277 respective, so the annual variety was 174. The air-ion concentration changed obviously between the two years, the increase quantity from 2004 to 2005 of the small positive-ion and small negative-ion concentration were 773 and 801 respective; the reduce quantity from 2004 to 2005 of the big positive-ion and big negative-ion concentration were 638 and 587 respective.The results showed that the air-ion concentration changed obviously in different urban function-area. The small negative-ion concentration was higher in garden area than in habitation, in campus, and in traffic road. The small positive-ion concentration was lower in garden area than in habitation, in campus, and in traffic road. The big...