The Effects of Meteorological Parameters on Hourly Emissions of Criteria Pollutants and Greenhouse Gases from Gasoline Engine Passenger Cars

Gasoline engine passenger cars are one of the most significant sources for emissions of local pollutants, namely, Carbon Monoxide (CO), Nitrogen Oxides (NOX), Sulfur Oxides (SOX), and Particulate Matters (PM), as well as emissions of greenhouse gases including Carbon Dioxide (CO2), Nitrous Oxide (N2O), and Methane (CH4), which has resulted in Tehran ambient air being noncompliant with legal air quality standards. This article provides an overview of the simultaneous effects of ambient temperature and humidity on emissions of criteria pollutants and greenhouse gases. In this work, traffic simulation and emission estimation were conducted by the IVE model, using long-term meteorological data. The findings of the present study indicated that a combination of high ambient temperature and low relative humidity increases the emissions of NOX, SOX, PM, CO2, and N2O from gasoline engine passenger cars. In contrast, when the average hourly temperature and humidity are maximum and minimum, respectively; The emission of CO reaches its minimum value. In conclusion, changing the working hours of offices and educational centers in such a way that the end of the working hours does not coincide with maximum temperature and minimum humidity, can be considered as a solution to reduce the vehicular emissions of criteria pollutants and greenhouse gases.