A common solution to reduce indoor air pollution is?

Increasing ventilation by mixing outdoor and indoor air is a widely recognized method to improve indoor air quality. This process helps dilute indoor pollutants by bringing in fresh outdoor air, which can significantly reduce the concentration of harmful substances present indoors, such as volatile organic compounds (VOCs), smoke, odors, and other contaminants. Proper ventilation can also help control humidity levels, which is crucial for preventing the growth of mold and dust mites.

While other options like using portable air filters, regular cleaning of air ducts, and increasing indoor plants can also contribute to reducing indoor air pollution, they may not be as effective on their own without adequate ventilation. Portable air filters help clean specific areas but may not address the overall air quality in a room. Cleaning air ducts can prevent the circulation of dust and debris; however, it does not introduce fresh air into the space. Adding indoor plants can improve air quality to some extent through photosynthesis and by absorbing certain pollutants, but their role is limited compared to the significant impact of proper ventilation.