Air purifier filters are not always answer to air quality problems. Solving problem is a much better approach than masking symptom.
The following are basic approaches to improve indoor air quality;
1) Eliminate or control pollutant source. 2) Dilution of contaminants through ventilation. 3) Removal or reduction of contaminants through filtration or purification with use of air purifier filters or air purifiers. Proper ventilation in a building is a must!
Before energy crunch in 1970's, fresh air in buildings was not really an issue. When energy costs started to rise, we started making our buildings more energy efficient with better insulation and sealing techniques that made building tighter, reducing amount of fresh air into buildings and increasing indoor pollution.
After indoor air quality issues came to surface, we learned how to reduce energy costs while not compromising health of occupants, through practice of building science.
Great strides have been made in this area, leading to more comfortable, healthier, safer homes.
The goal of good ventilation is to bring in right amount of fresh air, not too much or not too little.
This is accomplished by using mechanical ventilation (exhaust fans, energy recovery units, etc.) that are sized to volume of house and/or according to lifestyle.
Mechanical ventilation not only dilutes contaminants but also removes excess moisture that can become a mold problem if not properly addressed.
Moisture can show up as high humidity (under-ventilated bathrooms, indoor pools or hot tubs and very tight homes) or water that enters a building either from outside (rainwater) or from undetected plumbing leaks. Addressing these problems using right approach, elimination or control of source (in this case repair leak from outside or finding and repairing plumbing leak) makes more sense than trying to rid mold with air purifier filters or air purifiers.