摘要：通过全年两月一次随机选择北京市共34处办公室和35处家居作为样点,按照国家标准方法采集氨、苯、甲醛、总挥发性有机化合物和氡几种常见有害气体,并进行浓度水平的分析,调查其污染水平及季节变化情况。结果表明:北京市室内环境中氨、甲醛和总挥发性有机化合物的超标现象严重,苯属轻度污染,氡完全符合室内环境质量标准。不同季节污染物水平表现出差异:甲醛浓度在7月最高,氨、苯浓度在9月最高,氡浓度在春季左右达到最高,总挥发性有机化合物成分复杂,随时间变化规律性不明显。

关键词：室内空气污染；有害气体；浓度水平

Abstract：Aimed to investigate the pollution level and the seasonal variance of ammonia， benzene， volatile organic compounds （TVOC） and radon of Beijing residence， by sampling 34 offices and 35 residences once for two month， these toxic gases concentration was analyzed， in according with national standard methods. The results showed that indoor ammonia， formaldehyde and TVOC seriously exceed national standard， benzene pollution was lightly polluted. While radon indoor was in fully compliance to the national quality standards. The pollutants concentration varied through seasons: formaldehyde reached its highest concentration in July， ammonia and benzene in September， radon in the spring. Otherwise TVOC did not show obvious changes with time， due to its complicated composition. 

Keywords：indoor air pollution； toxic gases； concentration level