Relief from hay fever may be obtained by:

Relief from hay fever can indeed be facilitated by a combination of methods. Moving to a pollen-free area is one way to reduce exposure to allergens that trigger symptoms, such as pollen from trees, grasses, and weeds. This option provides the most direct approach by relocating to an environment with significantly lower allergen levels.

Acquired immunity is also relevant, as it refers to the body’s ability to become less sensitive to allergens over time. Techniques such as immunotherapy or allergy shots can gradually desensitize an individual to specific allergens, offering long-term relief from hay fever symptoms.

Finally, using air conditioning and air purification systems that are equipped with appropriate filters is instrumental in reducing indoor allergen levels. These systems can trap pollen and other allergens, providing a controlled environment that alleviates symptoms indoors, especially during high pollen seasons.

By incorporating all of these methods—relocating, building acquired immunity, and utilizing air purification techniques—individuals can significantly enhance relief from hay fever symptoms, making "all of the above" the comprehensive answer.