How can pets affect indoor air quality?

Pets can significantly influence indoor air quality primarily by contributing allergens and affecting ventilation systems. Animals often shed dander, fur, and saliva, which can become airborne and cause allergic reactions in sensitive individuals. This release of allergens can lower indoor air quality by increasing the levels of irritants in the air.

Moreover, pets can also impact the functioning of ventilation systems. For example, fur and dander can accumulate in air filters, leading to decreased efficiency of heating, ventilation, and air conditioning (HVAC) systems. When these systems are hindered due to the buildup of pet-related contaminants, the air circulation in the home can be compromised, resulting in poorer air quality.

The other options do not accurately reflect how pets influence indoor air quality. Pets do not enhance ventilation systems; they can actually obstruct them if proper cleaning and maintenance are not performed. While pets can increase humidity levels in some cases, such as through moisture from their breathing or via litter boxes, this is not a primary factor in defining indoor air quality impacts. Finally, claiming that pets reduce the need for cleaning overlooks the reality that regular cleaning is essential in households with pets to manage the allergens and particulates they contribute.