Which environmental factor is usually not a major concern for indoor plant health?

Air pollution is typically not a major concern for indoor plant health because indoor environments generally have lower levels of air pollutants compared to outdoor settings. While air quality can affect plant health, especially in urban areas, many pollutants are less concentrated indoors, and plants may be less sensitive to these effects when compared to factors like humidity levels, soil type, and light exposure.

Humidity is crucial for indoor plants because it affects their transpiration process and overall health. Soil type is important as it influences water retention, nutrient availability, and drainage, which directly impact plant growth. Light exposure is another critical factor since plants rely on photosynthesis for energy and growth, and inadequate light can affect their development and health.