Using monitored data of air sulphation speed for 1989-2003, the space-time change in (Xi 'an) City is analyzed.
依据1989—2003年监测数据，分析了西安市大气中硫酸盐的时空变化。
From space postitions, significant change area is northwest of Tongliao city and west and northeast of Xilinhot, and the area of Tongliao city around and Hulunbuir is also significant change area.
从空间位置上看，通辽市西北部及兴安盟西部和东北部变化最大，通辽市科尔沁区和四周旗县及呼伦贝尔市草地向林地演变的交错带为变化明显区域。
From space postitions, significant change area is northwest of Tongliao city and west and northeast of Xilinhot, and the area of Tongliao city around and Hulunbuir is also significant change area.
从空间位置上看，通辽市西北部及兴安盟西部和东北部变化最大，通辽市科尔沁区和四周旗县及呼伦贝尔市草地向林地演变的交错带为变化明显区域。
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