with good reason - the germicidal lamps (mercury vapour, UV-C spectrum) at the sort of power density needed to reliably disinfect cubic feet of air per second also produce noticable volumes of ozone, in much the same way the sun does to the air at high altitude. While this is also a germicide, it is very bad for humans to inhale over a long period.
During the terrible 1918 Spanish Flu pandemic, so that the show could go on, The Palladium Theatre, in November, used an ozone ventilating system and the strongest germ killer as a spray between all performances. The great unwashed appreciated the preventative efforts and attendances were good during the past week before the Financial Times' report.
