问题描述：
英语翻译
according to the measurements the steady-state ozone concentration in the test room operated with 0.5 air changes per hour was below the deteciton limit of the measurement instrument(0.002ppm).this is an indication of negligible ozone generation of the lightair lonizer.
according to the measurements the steady-state ozone concentration in the test room operated with 0.5 air changes per hour was below the deteciton limit of the measurement instrument(0.002ppm).this is an indication of negligible ozone generation of the lightair lonizer.
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