To identify the air-related legal provisions in India, we need to analyze each of the acts mentioned and determine their relation to air-related legal issues:

1. Air Act, 1981: This act is officially called the "Air (Prevention and Control of Pollution) Act, 1981." It is directly related to controlling air pollution and maintaining air quality by setting standards for emissions from automobiles, industrial plants, etc. Hence, it is air-related.
2. Wildlife (Protection) Amendment Act, 2002: This act primarily focuses on the protection of wildlife and does not specifically address air quality or pollution matters. Therefore, it is not related to air-related legal provisions.
3. Motor Vehicle Act, 1939: This act contains provisions concerning the control of vehicular emissions, thus impacting air pollution indirectly. Although significantly amended and replaced later, its foundational purpose included addressing air quality concerns due to vehicle emissions. Therefore, it is related to air aspects.
4. The Factories Act, 1948: This act regulates the working conditions in factories, including provisions for controlling emissions from industrial activities, impacting air pollution. Thus, it is relevant to air-related concerns.
5. Forest Dwellers (Rights) Act, 2006: This act deals with the rights of forest dwellers rather than air pollution. It does not directly contribute to air-related legal provisions.

After analyzing each act, we can conclude that the air-related legal provisions are found in options (a) the Air Act, 1981, (c) the Motor Vehicle Act, 1939, and (d) The Factories Act, 1948. Therefore, the correct answer is:

(a); (c); (d)

The selected options align with the guidelines for controlling air pollution and maintaining air quality in different contexts, namely industrial, vehicular, and environmental regulations.