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A Discuss on the Difference Between Haze and Fog and the Warning of Brownish Haze Weather

Wu Dui 1,2 (1. Institute of Tropical and Marine Meteorology,CMA,Guangzhou,510080) (2. Department of Atmospheric Science, Sun Yat-sen University, Guangzhou 510275)  
Along with the rapid development of economy and urbanization, atmospheric aerosol pollution is becoming worse. It is becoming a practical matter to distinguish haze and fog, and also an urgent issue needed to be solved. In the past, the operational standard using relative humidity to discern fog and haze is commonly on the low side over the southeast coastal provinces. To distinguish fog and haze should base on the change of influencing weather systems combining other influencing factors. So it is suggested that the weather phenomena of the visibility deterioration caused by atmospheric turbidness resulting in blur of visual field, should be determined as haze when relative humidity is less than 80%, while as fog when relative humidity is larger than 90%, and as a mixture of haze and fog but with haze still the majon component when the relative humidity is between 80% and 90%. It is also suggested to set up as soon as possible the brownish haze index and warning methods, to carry out the study on methods of predicting and warning brownish haze weather and to construct the operational platform, there by opening up the field of meteorological services and putting the products of environmental meteorology into better serving the public and government, to implement dynamic controlling of environmental protection measures.
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