Which method involves using equipment to remove or neutralize chemicals in the air?

When considering methods that involve using equipment to remove or neutralize chemicals in indoor air, it's important to recognize that several approaches can accomplish this goal, which is why selecting "all of the above" is appropriate.

Adsorption is a process where pollutants adhere to the surface of a solid material, typically activated carbon or other suitable media, thereby capturing volatile organic compounds (VOCs) and other harmful chemicals from the air. This method is effective for reducing specific contaminants and can be implemented in various air purification systems.

Chemical removal refers to methods that chemically transform or neutralize air pollutants. This can include processes like oxidation or reduction facilitated by specific equipment. Such systems often involve catalysts or chemical agents that react with harmful substances, converting them into less harmful compounds or capturing them for later disposal.

Filtration, while often thought of in terms of particulate removal, can also play a role in chemical removal. Advanced filters, including HEPA and activated carbon filters, can trap particles and absorb gaseous pollutants, thereby improving overall air quality.

Since adsorption, chemical removal, and filtration are all distinct methods that utilize equipment to actively remove or neutralize chemicals from the air, the most comprehensive answer encompasses all three methods, hence the selection of "all of the above." This reflects