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|Title:||Microprocessor controlled atmospheric ion counter: A study of large ions in Pune city|
|Keywords:||Atmospheric ion counter;Ion concentration;Aerosols;Vehicular pollution|
|Abstract:||An atmospheric ion counter was modified and fabricated to measure the atmospheric ions. The bias voltage of ion counter was adjusted using microprocessor and stepper motor. With the adjustment of bias voltage and flow rate of air through the instrument, the instrument is capable of measuring ions of all the three categories i.e. small ions, intermediate ions and large ions. Using this instrument ions of size range 3-24 nm were measured at different places in Pune city to study the aerosols generated by vehicles. The concentrations of positive large ions in Pune city were in the range 4000-45000 cm-3. Observations show that large ion concentration is directly related with traffic density. It is found that stability of atmosphere at any place plays an important role in the concentrations of large ions at that place. It also shows that tall trees act as scavengers of positively charged aerosol particles. These observations indicate that vehicular exhaust is generating charged aerosols.|
|Appears in Collections:||IJRSP Vol.35(1) [February 2006]|
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