The air ionisation in Suceava Metropolitan Area

: This study is the first of its kind, conducted for a city and its surroundings, in Romania. The air ionisation monitoring for Suceava Metropolitan Area (SvMA) was carried out with the PC Connectable Highly Accurate Air Ion Counter Tester COM-3200PRO II, in 34 points from SvMA (Suceava Metropolitan Area), in four time sequences of the year (January, March, July and November), in different parts of the day (morning, afternoon and evening), on active surfaces differentiated in properties (from anthropogenic to natural). The annual average value of the positive (n+) ion levels at the SvMA monitoring points was 576.6 ions/cm-3. The annual average of negative (n) ions at the monitoring points in SvMA in 2022 was 379.5 ions/cm-3. The study shows an annual regime of n-levels which has specifically a maximum in July (598.6 ions/cm-3) and an annual regime of n+, which has a minimum in the same month (415.3 ions/cm-3). The unipolarity coefficient (k) had a value of 1.52 for the whole of SvMA for the year 2022, ranging from 5.8 in January to 0.73 in July. The lowest k values were calculated for the observation points located in the rural localities from the vicinity of the urban perimeter of Suceava and for the natural ones from the