AIR ION VARIATION IN WINTER SEASON AT URBAN STATION SANGLI (17° 4' N 74° 25' E) AND RURAL STATION RAMANANDNAGAR (17° 4' N 74° 25' E) INDIA

摘要

In the atmosphere ions diffuse to aerosol particles and transfer their charge to the particles. In rural areas, the auto-mobile exhaust or other human activity cause introduction of large concentration of aerosol particles in the atmosphere. At urban station there are Imitited sources for the production of air ions, at the same time produced air ions are consumed by aerosol in the atmosphere.Therefore their concentrations in the atmosphere show large spatial and temporal variations. Variations of air ions in atmospheric air have been investigated using Gerdien type air ion counter. This air ion counter indigenously designed and developed at the Indian Institute of Tropical Meteorology Pune and operated at rural site Ramanandnagar and urban station Sangli. At urban station positive air count varies in the range 2-3 x10~2 ions per cm3, while positive air count at rural station varies in the range 5.5-8 x10~2 ions per cm3. Negative air ion count varies in the range 0.7-1.5x10~2 ions per cm~3 at urban station, while it varies in the range 5-7.9x10~2 ions per cm~3 at rural station. Such highly depleted negative ions and more concentrations of positive ions at urban atmosphere could trigger allergic respiratory disease and also decline in lung function. As compared to urban station rural station is healthy for human health.