Which of the following is a recommended action to improve air quality at home?

Replacing air filters regularly is a critical action to improve air quality at home. Air filters help to trap dust, allergens, and other pollutants present in indoor air. Over time, these filters can become clogged and less effective if not changed regularly, leading to increased levels of indoor air pollution. By maintaining a regular schedule for replacing air filters, you ensure that your heating, ventilation, and air conditioning (HVAC) systems operate efficiently, allowing for cleaner air to circulate throughout your home.

In contrast, options such as using air fresheners or burning scented candles can sometimes contribute to indoor air pollution rather than improve it, as they may release volatile organic compounds (VOCs) and other harmful substances into the air. Additionally, keeping windows closed can limit fresh air circulation, which is essential for maintaining good indoor air quality. So, regularly replacing air filters stands out as the most effective means of enhancing the air quality in your living environment.