Photochemical modeling is a type of computer modeling used to simulate the chemical reactions and processes that occur in the atmosphere as a result of sunlight interacting with pollutants emitted into the air. These models can help researchers understand how different pollutants interact with each other and with atmospheric components to form secondary pollutants such as ozone, particulate matter, and other harmful substances. Photochemical modeling can also be used to evaluate the effectiveness of air quality management strategies and to predict future air quality conditions under different scenarios.