Methane is a greenhouse gas, but it is not a major outdoor air pollutant.

Tobacco smoke is the leading cause of indoor air pollution in homes, as it releases harmful chemicals into the air.

Allergies are not typically associated with air pollution, although some pollutants can trigger allergic reactions in sensitive individuals.

Filtration is the process of removing pollutants from the air by passing it through a filter that traps the particles.

Burning scented candles can release harmful chemicals into the air, contributing to indoor air pollution.

Sick building syndrome refers to the condition where occupants of a building experience health problems that are linked to the building's indoor environment.

Plants are not typically a source of indoor air pollution in offices, although they can contribute to moisture levels and mold growth if not properly maintained.

Ventilation is the process of bringing fresh air into a building to replace stale air.

Carbon monoxide is not a common indoor air pollutant in schools, as it is primarily associated with outdoor sources such as vehicle exhaust.

Oxidation is the process of removing pollutants from the air using a chemical reaction that converts them into harmless compounds.

Tobacco smoke is not a common source of indoor air pollution in hospitals, as smoking is typically prohibited in healthcare facilities.

Adsorption is the process of removing pollutants from the air by trapping them on the surface of a solid material.

Pesticides are not a common source of indoor air pollution in restaurants, as they are typically used outdoors to control pests.

Filtration is the process of removing pollutants from the air using a physical barrier that traps the particles.

Pesticides are not a common source of indoor air pollution in gyms, as they are typically used outdoors to control pests.