Pollution levels refer to the concentration of harmful substances in the environment, which can affect air, water, and soil quality. Common pollutants include carbon dioxide, particulate matter, and heavy metals. These substances can originate from various sources, such as vehicle emissions, industrial waste, and agricultural runoff. Monitoring pollution levels is essential for public health and environmental protection. Governments and organizations use tools like air quality indices and water testing to assess pollution. High pollution levels can lead to health issues, such as respiratory problems and waterborne diseases, making it crucial to manage and reduce these harmful substances.