Question

building codes that require proper ventilation and limit the use of certain building materials can help deal with indoor air pollution in what way? by eliminating the need for building occupants to take action to improve indoor air quality by reducing indoor air pollution levels and improving public health by encouraging the use of more harmful and cheaper building materials by increasing both construction costs and building times unnecessarily

Explanation:

Proper ventilation and limiting certain building - material use in building codes can reduce indoor air pollutants, which in turn improves public health. Building occupants may still need to take some actions, and it doesn't encourage harmful materials use or increase costs and times for no reason.

Answer:

by reducing indoor air pollution levels and improving public health