Air pollution levels and different traffic density

The main anthropogenic causes of pollution are different

by Lorenzo Ciotti
Air pollution levels and different traffic density

The main anthropogenic causes of air pollution are different. Vehicle traffic, with the emissions caused by vehicle traffic, depend on the type of fuel, the type of vehicle and its age; all heat engines produce water, if powered by fossil fuels they produce carbon dioxide vehicles powered by diesel oil mainly emit particulates such as PM10 and below, hydrocarbons, nitrogen oxides and sulfur dioxide.

Domestic heating: here too the pollutants emitted essentially depend on the fuel used, the type of heating, its age and maintenance, the pollutants emitted are approximately the same as in vehicles with differences produced by coal and wood.

The research: Air pollution levels near crossroads with different traffic density and the estimation of health risk, published on the Environmental geochemistry and health, analyzes: "The aim of this study was to determine the influence of traffic density on air pollutant levels as well as to analyze the spatial and temporal distribution of particulate pollutants and their health risk.

The following species related to traffic pollution were measured: PM10, elemental and organic carbon and polycyclic aromatic hydrocarbons (PAHs) in PM10 and gas pollutants (SO2, NO2 and CO). The measurements were carried out at four crossroad sites in the city.

Samples of PM10 were collected over three periods (6 am to 2 pm, 2 pm to 10 pm and 10 pm to 6 am) on working days and weekends. Statistically significant differences were found between sampling sites for all pollutant concentrations, except for NO2.

The highest mass concentrations of PM10, carbon and PAHs were observed in the south of the city with the highest traffic density. Concentrations of gasses (CO and NO2) showed high values ​​in morning and in the late afternoon and evening (west and east).

At all measuring sites, the highest concentration of particle-bound pollutants was mostly recorded during morning and afternoon, except at the south, where elevated PAHs concentrations were recorded during night period, which indicated that residential heating takes up a portion of pollution sources in this area.

Although for most of the pollutants the concentrations varied during the day, statistically significant differences between sampling periods were not found. The highest health risk was obtained at the south, where it was scored as significant."