The impact of humidity and road surface temperature varying by daytime on the dispersion of air pollutants

Issakhov A. Abylkassymova A.
December 2025 Springer Nature

International Journal of Environmental Science and Technology
2025 #22 Issue 16 16351 - 16384 pp.

This work considers a numerical study of the spread of pollutants emitted by vehicles in a residential area of Almaty, consisting of several buildings and educational buildings, which are located on both sides of the road from the roadway. By constructing the quarter, special attention was paid to choosing the optimal barrier height to improve air quality, taking into account various external factors. Numerical modeling was used to solve the problem. The mathematical model was based on the averaged Reynolds equation, taking into account the buoyancy force, the equation for temperature and the equation for concentration transfer. The SIMPLE algorithm was used to numerically solve the problem. To maximize the approximation to reality, the mathematical model took into account the influence of wind direction, changes in temperature on the surface of the roadway and the environment, which depends on time and air humidity. Calculations were made for the period from 9 am to 9 pm (12 noon). From the obtained numerical solutions, it was determined that regardless of the type of pollution, the presence of barriers along the road has a beneficial effect on pedestrian areas. A 4-m barrier was chosen as the most suitable height. It should also be noted that taking into account air humidity significantly changes the nature of the distribution of concentrations and temperature changes over time in a residential area. It was also found that the presence of barriers has a beneficial effect on the local area, in which the average concentration value decreases more than 10 times for the pedestrian zone located on the left side and more than 5 times for the pedestrian zone located on the right side compared to the option without a barrier. As we can see, the numerical results obtained when conducting modeling for the distribution of pollutants in a residential area taking into account external factors differ significantly compared to without taking into account air humidity.

Different barrier heights , Heat and mass transfer , Relative humidity , Road surface temperature , Vehicles emission dispersion

Text of the article Перейти на текст статьи

Kazakh British Technical University, Almaty, Kazakhstan
Al-Farabi Kazakh National University, Almaty, Kazakhstan
International Information Technology University, Almaty, Kazakhstan

Kazakh British Technical University
Al-Farabi Kazakh National University
International Information Technology University

10 лет помогаем публиковать статьи Международный издатель

Книга Публикация научной статьи Волощук 2026 Book Publication of a scientific article 2026