Spatial Assessment of Seasonal Changes in Pollution of the Air Ground Layer with Aerosol Particles in School Yards of Tiaret city (Algeria)

According to the data obtained in the autumn-winter period, the excess of PM2.5 in air during the schoolday after a short stay by pupils in the school yards was 1.5 –2 times. The PM2.5 concentration in the autumn - winter period was up to 1.5 times higher than that of the spring – summer time. High concentrations of dust particles are observed in areas close to heavy traffic in winter in the South-Eastern part of the city. Low concentrations were recorded in the autumn-winter time in areas adjacent to forests in the North –Western part of the city of Tiaret. However, the protective function of forest stands in the spring – summer period in the North-Western part of the city of Tiaret is less evident. The need for introduction of several nature protection measures in the city is obvious. Among them: fuel quality control and fines for the use of low-grade fuel, increasing the density of trees and shrubs in the city in the areas uncovered by vegetation.