The study aims to analyze and evaluate the levels of indoor air pollution with gases in Libyan iron and steel company. The study used the descriptive analytical method to analyze the data and record the results. The study found that the average concentrations of nitrogen oxides reached about 24 micrograms/m³ over the various areas inside the factories, which is a rate considered good and falls within the framework of international values and regulations for globally accepted and healthy air quality issued by the World Health Organization (WHO), which indicates It concluded that the level of emissions of nitrogen oxides into the environment does not exceed 40 micrograms/m³, and it also concluded that carbon monoxide (CO) was one of the most common types of gases emitted within the factories of the Libyan Iron and Steel Company in Misrata, where emissions from the various factories amounted to about 118,213.7 mg/ m³, The results also concluded that the air quality index in the city of Misrata, Libya, on July 23, 2023, reached 74 degrees, which is an average score for air quality according to the US Environmental Protection Agency (2009) classification, and therefore falls into the second category, which ranges from 51 to 100.