Abstract
The results of air quality monitoring in automatic stations in the North-East Region-Romania (RNER) region in the period 2009 - 2020 indicated that the declared ozone concentration values were generally lower than those regulated by law - information threshold > 180 μg/m3 as required by Directive 2008/50/EC and Law 104/2011. Air quality in RNER relative to ozone concentration was good, with only one exceeding of the information threshold (NT1 - 28 April 2009, 12:00 - 180,28 μg/m3). The highest multi-annual averages (2009 – 2020) were calculated for IS 4 stations (59,5 μg/m3), EM 3 (53,4 μg/m3) and SV 1 (50,3 μg/m3). High values were generally recorded at urban-type stations, where urban characteristics, heavy road transport and the presence of airports generated high ozone concentrations. The lowest multi-annual ozone concentrations were calculated for stations VS 1 (41,5 μg/m3), BC 2 (41,9 μg/m3), IS 3 (42,0 μg/m3) and BC 3 (42,7 μg/m3). Low values were generally registered at industrial stations, where the atmospheric calm and the frequency of urban haze favored the accumulation of pollutants on the soil surface, limiting the formation of ozone. Ozone pollution is viewed with concern by environmental specialists in RNER, due to the fact that this element has a negative impact on people and the environment.
Highlights
Tropospheric ozone is a strong oxidant with a characteristic odor of bluish color and very toxic
There are studies that emphasize the correlation between climate elements and ozone concentration (Baur et al, 2004; Salve et al, 2007; Khiem et al, 2010)
The results of the air quality monitoring in the automatic stations belonging to the RNMCA on the territory of RNER, in the period 2009 - 2020, indicated that the values of recorded ozone concentrations were generally lower than the information threshold (> 180 μg / m3) provided of Directive 2008/50/EC and Law 104/2011
Summary
Tropospheric ozone is a strong oxidant with a characteristic odor of bluish color and very toxic. There are studies that emphasize the correlation between climate elements (air temperature, atmospheric precipitation, wind regime) and ozone concentration (Baur et al, 2004; Salve et al, 2007; Khiem et al, 2010). Ozone levels typically reach values around 45-60 μg/m3 in the afternoon, and during the night to morning due to the downward movements of the air that drives ozone from top to bottom, towards the basal atmospheric layer and the fact that that this downward movement does not compensate for the absence of UV radiation, ozone levels remain low (Kalabokas et al, 2020)
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