Air pollution is defined as the presence of which of the following in the outside air?

Air pollution refers to the contamination of the atmosphere by harmful substances that can be found in various physical states. The presence of solids, gases, and liquids in the outside air constitutes air pollution because these elements can adversely affect human health, ecosystems, and climate.

Solids in the context of air pollution often include particulate matter such as dust, soot, and smoke. These tiny particles can be inhaled and have significant health impacts. Gases, such as carbon monoxide, sulfur dioxide, and nitrogen oxides, are common pollutants released from vehicles, industrial processes, and burning fossil fuels. Similarly, liquids can include various aerosols or droplets that carry harmful chemicals into the atmosphere.

By encompassing all three states of matter—solids, gases, and liquids—the definition accurately reflects the diverse range of pollutants that can compromise air quality and highlights the multifaceted nature of air pollution sources and effects. This comprehensive perspective is crucial for assessing air quality and implementing public health measures.