ABSTRACT
Dew water is the result of water vapor condensation. The interactions dew–atmosphere and dew–substrate during one night time will then give to dew water specific chemical and biological properties, different from fog or rain. In some urban areas, dew water can be very aggressive and cause degradation to roofs, cars, and generally to any inorganic matter that can be corroded. In dew water, the variability of electric conductivity is large. There is a general trend that the overall concentration as measured by electrical conductivity decreases with dew volume as an effect of aerosol dilution. The origin of air masses can vary the aerosol concentration. The origin of the air mass can be obtained by using the Hysplit model. The source of anthropogenic and natural species can be found by different techniques, including air mass trajectory and stable isotope analyses. In general, regional urban pollutions have significant influence on dew water chemistry.
