Air pollution is one of the major environmental issues facing the world today. It is caused by a variety of sources such as burning fossil fuels used in cars and factories, agricultural practices, and naturally occurring sources. Air pollutants can be divided into two major categories: primary and secondary. Primary pollutants are those that are released directly into the atmosphere from sources such as industrial processes, motor vehicles, and solvents. Secondary pollutants are those that are formed in the atmosphere when a primary pollutant reacts with other compounds. Air pollution is a major global health problem. Pollutants in the air are linked to respiratory illnesses, cardiovascular disease, asthma, and cancer. Pollutants can also cause harm to the environment such as acid rain and smog. Air pollution is an issue that needs to be addressed globally. To reduce air pollution, countries are implementing policies aimed at reducing emissions from fossil fuel burning, encouraging the use of renewable energy sources, and increasing energy efficiency. Some cities and countries are also creating "eco-zones" and other areas that are less polluted than the rest of the city. Additionally, individuals can reduce their contribution to air pollution by limiting their use of cars and choosing more environmentally friendly alternatives such as using public transportation or cycling. Air pollution is a serious global problem that needs to be addressed through legislation and public action. Awareness about the issue has grown in recent years, making it clearer than ever that action must be taken to reduce air pollution and protect our health and our environment.