Which plant health factor is least likely influenced by indoor air quality?

The chosen answer focuses on air pollution, which is primarily an outdoor environmental factor and less impactful on indoor air quality. Indoor air quality mainly addresses the conditions within enclosed spaces, impacting plants through factors such as humidity, temperature, and the presence of indoor pollutants, but it does not typically encompass broader air pollution issues, which are relevant in outdoor settings.

Nutrient absorption, pest infestations, and water quality are all directly influenced by conditions within the indoor environment. For instance, improper ventilation can lead to a buildup of humidity, affecting pest populations and diseases. Additionally, the availability and uptake of nutrients can change based on water quality, which is often affected by indoor conditions such as the presence of contaminants or pH levels in the watering system. Understanding how these factors relate to indoor environments clarifies why air pollution, linked more to outdoor spaces, is less of a concern for plant health indoors compared to the other factors mentioned.