The study was conducted in Salah al-Din Governorate - northern Iraq, during the period from 1/11/2021 to 30/3/2022, with the aim of evaluating the level of pollutants in the atmospheric air for three areas: Al-Boutama (rural area), Baiji refinery (oil industry area), and the city of Tikrit (a densely populated area), the concentrations of toxic gases were measured: sulfur dioxide (SO 2 ), nitrogen oxide (NO), nitrite (NO 2 ), hydrochloric acid (HCl), hydrogen fluoride (HF), carbon dioxide (CO 2 ) and carbon monoxide. (CO), using the Wolf Pack Modular Area Monitor. The results were as follows: Significant differences were found between the study sites for all the variables tested, and Baiji refinery recorded the highest values for each of the variables SO 2 , NO, NO 2 , HCl and HF, which amounted to 2.54, 8.28, 6.4, 10.62 ppm and 0.42 mg/ m ³ , respectively. November 2021 recorded the highest concentrations of HCl and CO compounds with averages of 7.6 ppm and 18.37 mg/m ³ , respectively, while January 2022 recorded the highest averages of NO 2 , HF and CO 2 , which amounted to 5.27 ppm and 0.4 mg/m3 and 791 ppm, respectively, the interaction between Baiji refinery site and the months of November, December and January recorded the highest concentrations of pollutants amounting to 4.4 ppm for SO 2 concentration, 11.2 ppm for NO concentration, 7.9 ppm for NO 2 concentration, 13.8 ppm for HCl concentration, and 0.7 mg/m ³ for HF concentration, and 16.5 ppm for VOCs concentration.