A pollutant that is mostly associated with acid rain is

The pollutant that is mostly associated with acid rain is nitrogen (IV) oxide, also known as nitrogen dioxide (NO2). When nitrogen oxide is released into the atmosphere, it reacts with other gases to form nitric acid and other acidic compounds. These compounds then fall to the earth's surface as acid rain, which can have harmful effects on the environment, including damaging plant and animal life and corroding buildings and infrastructure. Nitrogen oxide is primarily produced by human activities, such as burning fossil fuels and operating transportation vehicles.