Pollutants are substances that contaminate the environment, causing harm to ecosystems and human health. They can be found in various forms, including gases, liquids, and solids. Common examples include carbon monoxide, sulfur dioxide, and heavy metals, which can originate from industrial processes, vehicle emissions, and agricultural activities. The impact of pollutants is significant, leading to issues such as climate change, acid rain, and respiratory diseases. Efforts to reduce pollutants involve regulations, technological advancements, and public awareness campaigns aimed at promoting cleaner practices and sustainable living.