According to Time Magazine, Fresno is one of the top 10 cities in the U.S. with a poor AQI (Air Quality Index). The AQI is a national reporting standard on the quality of the air we breathe. Bad air is a fact of life for us in the Fresno area, and a sub-par AQI can translate into poor indoor air quality as well, which is why using electrostatic air filters in your home is recommended.