A more thorough explanation:

The store-receiver exemption, also known as the Aiken exemption, is an exception in the law of infringement that allows retail establishments with less than 2,000 square feet of space to play radio and television broadcasts for employees and patrons without obtaining a license. This exemption was established in the case of Twentieth Century Music Corp. v. Aiken in 1975.

For example, a small coffee shop can play music on the radio without having to pay for a license because it falls under the store-receiver exemption.

An airbill is a document that serves as a bill of lading for goods transported by air. This includes air consignment notes and air waybills.

For example, when a company ships a package via air freight, they will use an airbill to document the shipment and track its progress.

Air pollution refers to any harmful substance or energy emitted directly or indirectly into the air, especially if it harms the environment or public health and welfare.

For example, emissions from factories and cars contribute to air pollution, which can cause respiratory problems and other health issues for people living in the surrounding areas.