Chen Baoshan, chief of the operations management department of Beijing Environment Sanitation Engineering Group Co. Ltd, attributed the decline to the growing public awareness of air quality.

据北京环卫工程集团有限公司运营管理部主任陈宝山表示称，这一现象的原因是因为公众对空气质量的认识日益加强。

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Conclusion: Combined use of ultraviolet lamp and dynamic disinfector make the air quality in occupied car fulfil the requirement of sanitation standard.

结论，用紫外线灯与动态消毒机配合使用，可使采血车工作中空气质量达到卫生标准要求。

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Since the device is sealed in the constant pressure water supply, Entirely keep the water quality sanitation tagging, Because do not contact with air, Avoid secondary pollution and vandalism.

由于该设备是密闭的恒压供水，完全保持了水源的水质卫生标注，由于不与空气接触，避免二次污染和人为破坏。

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"China has reduced extreme poverty through economic growth, but until very recently has overlooked the growing inequalities in health and health determinants like access to clean air,water, and sanitation."

VOA: standard.2010.04.07

More broadly, dirty water and air, and poor sanitation, are the biggest preventable causes of death.

ECONOMIST: The Johannesburg summit

The ship generates and distributes its own power, provides and maintains sanitation, heating, ventilation and air conditioning systems, and makes several hundred thousand gallons of water every day from sea water.

FORBES: What Is It Like To Be The Commanding Officer Of An Aircraft Carrier?