The long distance transport of pollutant from the direction of se , ene and etc , has some influences to the variation of surface o3 over waliguan , due to the short life of precursors , and the long distance between two sites as well as the weak photochemical reaction over this area , the influence of wind direction is not so important ( 7 )在se 、 ene等东北方向上污染物( no _ x等)的长距离水平输送对瓦里关地面o _ 3具有一定的影响。但由于o _ 3前提物在大气中的寿命较短，两地又相距较远，而且瓦里关地区光化学反应很弱。因此，水平风向对地面o _ 3影响不大。
Regional photochemical reaction is weak over this area , to a great extent , the atmospheric background condition influences to the variation of surface o3 , tthe variation of vertical wind speed is significant to surface o3 , from seasonal distribution of vertical wind , it appears upward air current in winter , spring and autumn , repectively , while it is mainly downward in summer , it is favorable to the o3 transport from stratosphere layer . at walilguan , the variation of humidity impacts a little on surface o3 , the relationship between surface o3 and wind speed is relatively complicated , by correlation statistic analyze , it is sure that the wind speed is not one of the important factor ( 2 )瓦里关地区局地光化学反应较弱，地面o _ 3在很大程度上受大气背景状况的影响； ( 3 )垂直风变化对地面o3日变化影响较大，从垂直风季节分布看，春、秋、冬三个季节为上升气流，而夏季下沉气流则很旺盛，这种分布有利于平流层o _ 3向下的输送； ( 5 )湿度对地面o _ 3贡献并不明显； ( 6 )各季节水平风速与地面o _ 3之间的关系较为复杂，不同季节相关分析表明，水平风速并不是影响地面o _ 3变化的主要因子之一。
When a temperature inversion is formed in the pearl river delta ( prd ) region , or when a weak northerly or northwesterly wind prevails , ambient air pollutants ( including nitrogen oxides ( nox ) and volatile organic compounds ( voc ) ) in the region will be trapped easily in the lower atmosphere and cannot be dispersed effectively . the above factors , if coupled with strong sunlight , will generate ozone under photochemical reaction between nox and voc and lead to the phenomenon of photochemical smog 当珠江三角洲区域一带出现逆温层，或者吹微弱北或西北风时，区域内空气中的污染物（包括氮氧化物及挥发性有机化合物）很容易会被困在大气的低层，不能有效消散；如再加上强烈的阳光，氮氧化物与挥发性有机化合物便会产生光合化学反应，形成臭氧及引致光合化学烟雾现象。
