total bacterial count in air 空气中细菌总数
After discontinuation of use of photocatalyst, the bacterial count in air returned to the original level.
停止使用光催化剂之后，空气中细菌数恢复到原来水平。
Conclusion: the water in ultrasonic humidifier was apt to breed bacteria and contaminate the environmental air. With prolonging the time of continuous use, the bacterial count increases gradually.
结论，超声波加湿器内水容易滋生细菌并污染环境空气，随着连续使用时间的延长，菌数逐渐增加。
Results: The air bacterial count of the working areas of negative-pressure ward increased in the order of clean area-semicontaminated area-contaminated area (negative-pressure ward).
结果，负压病房工作区空气含菌量从清洁区-半污染区-污染区（负压病房）依次升高；
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