In order to study the relevance between special weather and discharge characteristic of the air gap under a new atmospheric condition in which fog-haze happen frequently because of serious air pollution. In this paper

automatic discharge monitoring systems are installed in Guangzhou to monitor the breakdown voltage of an air gap and atmospheric parameters（such as relative humidity

visibility and etc.）.Combined with air quality data in the local weather bureau

the relevance and its reason between the dramatic decline of air gap breakdown voltage and fog-haze weather is studied. The research shows that the probability of the dramatic decline of breakdown voltage during the fog-haze weather is greater than the annual average. The dramatic decline of breakdown voltage occur in the range of air quality index of less than 120

namely

air quality is excellent

good and light pollution

but dramatic decline of air gap breakdown voltage is almost not occur under only gray-haze weather. Based on the comprehensive analysis

the paper put forward the electric field distortion（condensation due to high humidity）on the electrodes surface rather than air pollution is the main reason of significant drop of air gap breakdown voltage under the fog-haze weather.