Purified air is provided, having a TVOC content of from less than 5 ppb to about 500 ppb, a Biologicals content of from less than 1 CFU/M 3 to 150 CFU/M 3 and a Particulate content of from about 1,000 0.3 µm particles per ft3 to about 50,000 0.3 µm particles per ft 3, or from about 600 0.5 µm particles per ft 3 to about 500,000 0.5 µm particles per ft 3.