Ecologia Balkanica

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https://doi.uni-plovdiv.bg/handle/store/4
p-ISSN: 1314-0213 / e-ISSN: 1313-9940

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Browsing Ecologia Balkanica by Subject "air pollution"

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    Ecological effects of changes in Air-Fuel Ratio of a gasoline engine on exhaust harmful gases emissions
    (Plovdiv University Press "Paisii Hilendarski", 2024-06-16) Kanevski, Hristo; Lyubomirov, Slavi; Asenov, Svetoslav; Parushev, Anatoliy; Petrova, Slaveya
    The present study examines the effect of the air-fuel mixture ratio on harmful emissions from a gasoline engine, analyzed from an ecological perspective. The experiments were carried out with a BMW 318 gasoline engine equipped with a MegaSquirt 3 electronic control unit and TunerStudio MS software, as well as a Kane AUTOplus gas analyzer. The concentrations of three gaseous pollutants - carbon monoxide (CO), carbon dioxide (CO2) and unburned hydrocarbons (HC), were measured at different engine speeds and different air-fuel ratios. The obtained data were used to compile regression equations that describe the relationship between the air-fuel mixture ratio and the harmful emissions levels. The results show significant changes in gaseous pollutants’ emissions depending on engine settings, which highlights the importance of optimizing these parameters to reduce both the environmental pollution and greenhouse gases levels into the atmosphere.
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    The relationship of atmospheric pollutants and meteorological variables for the Sofia region, Bulgaria
    (Plovdiv University Press "Paisii Hilendarski", 2024-05-25) Baubekova, Gaukhar; Tauakelov, Chingis; Daribayeva, Sevara; Gosteva, Lyudmila
    The research on the relationship between meteorological conditions and atmospheric air pollution in Sofia city was conducted based on 1-hour data on meteorological variables (air temperature, global solar radiation, wind speed) and atmospheric pollutants (NO2, CO, O3, SO2, PM10) for 2012-2016. As a result of the correlation and regression analysis of the influence of meteorological variables on the daily concentrations of atmospheric pollutants, the strongest effect is expressed in ozone (O3), nitrogen dioxide (NO2), sulfur dioxide (SO2) and particulate matter (PM10). In urban areas, air temperature (AT), the intensity of global solar radiation (GSR) and, wind speed (WS) have a stronger impact on the concentration of pollutants. There is a strong correlation between air temperature (r = 0.53 ÷ 0.76) and solar radiation (r = 0.65 ÷ 0.77) with ozone concentrations. An exception is the area of Orlov most, where there is an average correlation with temperature and a minor correlation with solar radiation. In regions (except Kopitoto) there are average correlations between air temperature and PM10, SO2, and CO (r = 0.55 ÷ 0.62). There is a weak correlation between NO2 and air temperature and solar radiation in the areas of Druzhba and Nadezhda.