广州市近年空气质量现状及趋势分析

为掌握广州市空气质量现状及其变化趋势,对广州市2001～2009年空气质量监测数据进行系统的分析。结果表明,近年来广州市空气质量总体良好;整体空气质量有逐步好转的趋势,尤其是SO2浓度下降明显,NO2稳中有降,PM10略有下降但2009年仍有上升趋势,且PM10超标率居于首位;污染物浓度时空分布不均匀,NO2与PM10夏季浓度较低,春冬季较高,表现出明显的季节性特征;主城区NO2浓度明显较高,但总体呈下降趋势,主城区外NO2浓度较低,但呈上升趋势。全年灰霾天数也呈现下降的趋势,变化规律与PM10浓度变化规律一致。

The Analysis of the Current Situation and the Variation Trend of Air Quality in Guangzhou

The air quality monitoring data were analyzed during 2001~2009 to find out the current situation and the variation trend of air quality in Guangzhou. It is shown that the air quality of Guangzhou in the past 10 years was generally good. And the rate of PM₁₀ that exceeded the standard II was higher than other pollutants. The overall air quality has been getting better gradually, especially the concentration of SO₂ has dropped obviously as well as that of NO₂ has been steady and decreased a little. However, the concentration of PM₁₀ seemed to increase in 2009 after dropping. The distributions of three main air pollutants varied with timescale and space. The seasonal feature of NO₂ and PM₁₀ have been found when their concentrations in summer were much lower than those in spring and winter. The concentrations of NO₂ in downtown were significantly higher than those in the outskirt, which the former has been going up while the later getting down.