Which of the following is NOT listed as a control measure to reduce poor indoor air quality in arena facilities?

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Controlling indoor air quality in arena facilities centers on reducing pollutant sources, improving removal of contaminants, and keeping equipment in good working condition. Substituting combustion engines with electric or cleaner-fuel options lowers the amount of pollutants released into the air. Making design or process modifications, like extending exhaust paths or adding catalytic converters, helps capture or convert emissions before they affect indoor air. Regular maintenance and inspections ensure equipment runs correctly, reducing leaks, malfunctions, and unintended releases that can worsen air quality. Ultrasonic cleaning of benches, while useful for sanitation, is not a method that reduces emissions or directly improves air quality; it’s a cleaning process that does not address IAQ at the source. So it isn’t listed as a control measure for poor indoor air quality.