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Relative humidity plays a significant role in determining indoor air quality in homes because it can directly influence the growth of indoor pollutants, such as mold, dust mites, and bacteria. When relative humidity levels are too high, typically above 60%, it creates an environment conducive to the proliferation of these contaminants, which can lead to health issues such as allergies, respiratory problems, and other illnesses.

By maintaining appropriate levels of relative humidity, usually between 30% and 50%, it helps in controlling these indoor air contaminants effectively. Regulation of humidity levels not only reduces the likelihood of biological growth but also aids in overall comfort, potentially minimizing the presence of odors and irritants in the air.

While temperature and seasonal variations certainly can impact indoor air conditions, the assertion that humidity solely affects temperature or has no relevance to air quality overlooks its critical function in maintaining a healthy indoor environment. Therefore, managing relative humidity is essential not only for comfort but also for ensuring a high standard of air quality in homes.