The present status of Huaihua environmental air quality were studied, and the spatial-temporal characteristics and causes of air pollutants (SO2, NO2 and PM10) were analyzed based on the atmospheric monitoring date in Huaihua city from 2001 to 2010. The results indicate that the content monthly variation of SO2 in Huaihua city was a relatively obvious changing law " high-low-high " from 2001 to 2009. in January, February, March, October, November and December the SO2 content was quite serious, the air pollutants density was lower in June to August. The monthly variation law of NO2 content was similar to SO2, which also showed a " high-low-high " variation, in January, February, November and December NO2 pollution was quite serious, in July to September the air pollutants density was lower. The content of PM10 has no obvious monthly variation. For all type of pollution matters, their concentrations were all higher in winter and spring, and were lower in summer and autumn. The average concentrations of the all type pollution matters were the highest in spring. The concentration of SO2 declined year by year while the annual average concentration of NO2 increased first and then decreased. The annual average concentration (AAC) of NO, maximum was in 2004. The AAC of PM10 decreased first and then increased. The AAC of NO2 minimum was in 2007. The results of correlation analysis showed that SO2 PM,o and NO2 concentration were significantly positive correlation while NO2 and PM10 concentration was a non-significant positive correlation. In each county (area) of Huaihua city, the air environmental pollution was a typical smoke pollution. The coal consumption and inversion phenomenon in spring and winter were the main reasons for the variation of pollutants concentration in Huaihua city.%基于2001～2010年怀化市环境空气质量常规监测数据,研究了怀化市区环境空气污染物SO2、NO2、PM10含量的时间变化特征及其成因.结果表明:从2001～2010年,怀化市区环境空气中SO2含量月变化呈现出明显的“高—低—高”变化规律,1、2、3、10、11、12月含量较高,6～8月含量较低；NO2含量的月变化规律与SO2相类似,1、2、11、12月含量较高,7～9月含量较低,PM10含量没有明显的月变化规律；SO2、NO2、PM10含量的季节动态特征相似,均表现为春、冬季含量较高,夏、秋季含量较低,春季平均含量值最高,SO2含量的年际变化表现出逐年下降的趋势,NO2含量的年际变化表现出先上升后下降的变化趋势,NO2年平均含量最大值出现在2004年；PM10含量的年变化表现出先下降后上升的变化趋势,PM10年平均含量最小值出现在2007年；SO2与PM10、NO2之间呈显著正相关关系,NO2与PM10之间的相关性不显著.怀化市环境空气污染属于典型的煤烟型污染,燃煤量和怀化市春、冬季逆温现象是影响怀化市环境空气污染物含量变化的主要原因.
展开▼
