- Construction sites are responsible for generating a high concentration of pollutants in surrounding air. Emission level can be different depending on the materials used for the construction. One of the methods for quantifying air pollution is to measure particulate matters (PM) emitted on construction sites. This study aims to determine the concentration of PM produced from two construction sites using different materials; cross-laminated timber (CLT) and steel. A reference location was also used in order to compare the concentration level with the construction sites. A total of 900 data points of four different particulate matter sizes (PM1.0, PM2.5, PM4.0, PM10) were collected from all three locations over a period of 5 days. Data analysis supports that construction sites emit significantly higher concentration of PM than other locations. In majority of the cases, concentration levels were found below the United States Environmental Protection Agency (USEPA) standard for particulate matters. The outcomes of this study provide a considerable understanding of PM emission in construction sites and relationship of emission level with different construction materials and activities. Furthermore, this study determines the correlations of different PM sizes measured for the study.