Air pollution is the presence of ______ in the outside air in amounts that are injurious or detrimental to humans, animals, plants, or property.

Air pollution refers to the introduction of harmful substances into the atmosphere in a concentration that poses a risk to health, ecosystems, or property. The presence of solids, gases, and liquids can all contribute to air pollution in various ways.

Solids such as particulate matter can come from dust, smoke, or soot and can have serious health consequences when inhaled. Gases like carbon monoxide, sulfur dioxide, and nitrogen oxides are well-known pollutants that can lead to respiratory problems and contribute to environmental issues like acid rain. Liquids in the form of aerosols or vapors can also pollute the air, potentially carrying harmful chemicals or organic materials that affect air quality.

Thus, understanding air pollution in a holistic manner is crucial, recognizing that all forms of matter—solids, gases, and liquids—can be agents of harm when they contaminate the air we breathe. This comprehensive view aligns with the recognition that various pollutants can have synergistic effects on health and the environment, emphasizing the need for a broad approach to air quality management.