GHEORGHE LAZAR, CAMELIA CAPATINA, CLAUDIA MARIA SIMONESCU<br>Analysis of Nitrogen Oxides Levels Measured in Turceni Area

GHEORGHE LAZAR, CAMELIA CAPATINA, CLAUDIA MARIA SIMONESCU
Analysis of Nitrogen Oxides Levels Measured in Turceni Area

Abstract:

Nitrogen oxides emitted primarily from the burning of solid, liquid and gases in various industrial plants, residential heating, commercial and from road traffic have many negative effects to the environment and human health. Nitrogen oxides contribute to the aquatic ecosystems eutrophication and to the acidification of environmental components such as soil, and water with consequences to the terrestrial and aquatic ecosystems, buildings and monuments. NO2 can be transported long distance and has an important role in atmospheric chemistry, including the formation of tropospheric ozone. Exposure to high concentrations of nitrogen dioxide causes inflammation of the lung, increasing risk of respiratory diseases and asthma. Thus, monitoring of NO, NO2 and NOx levels are very important for air quality assessment, and to take measures when a pollution episode has been found. Nitrogen oxides (NO, NO2, and NOx) have been monitored using an automatic station code GJ - 03 located to the northwest of Turceni Thermal Power Station. Values obtained were compared to the quality standards set by regulations. The hourly concentrations of NO2 recorded during 2013 were below 200 mg/m3 - value representing the hourly limit value for human health protection. High levels of NO2 in the area investigated were registered on July and October. The highest NO hourly concentration (190.61 mg/m3) was recorded on October, and the lowest NO hourly concentration (3.56 mg/m3) was recorded in spring and summer months. NOx highest hourly concentration (396.04 mg/m3) was registered on October. Regarding a possible correlation between the concentrations of NOx and wind direction, it can not be made because the automatic station for monitoring air quality in the area is located to the northwest of Turceni Thermal Power Station, and wind direction from the station (SE to NW) in the months analyzed represented only 4.2 % of the time. Results regarding daily cycles of NO, NO2 and NOx in the urban atmosphere have shown that their concentrations are strongly affected by traffic emissions, and photochemistry activity. Keywords: NOx levels, nitrogen oxide in the atmosphere, nitrogen oxide monitoring, air pollution

Issue: 2014, Volume 65, Issue 11

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