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调查天津市区办公室、平房、单元住房内空气负离子浓度，结果分别为２８６±２５、１９４±３３、２３１±３３个／ｃｍ３。办公室进入５人，吸烟前后负离子浓度由２３２±２２降至５０±１６个／ｃｍ３，而ＣＯ和粉尘浓度分别由２．９±０．７３、０．７６±０．０７上升至１９．６±４．４和１．１３±０．２ｍｇ／ｍ３。采用开门窗通风、喷洒空气清新剂和使用负离子发生器等措施后，室内负离子浓度分别由２７９±２２、２９２±２１、４７２±４９提高至４２４±２７、１４６５±９９和１４１５３±１２２２个／ｃｍ３，表明３种措施可使空气负离子浓度均能得到明显改善。
The air negative ion concentration in the offices, bungalows, and unit housing in Tianjin was investigated and the results were 286±25, 194±33, and 231±33/cm3, respectively. In the office, there were five people. Before and after smoking, the negative ion concentration decreased from 232±22 to 50±16/cm3, while the CO and dust concentrations increased from 2.9±0.73 and 0.76±0.07 to 19.6±, respectively. 4.4 and 1.13±0.2 mg/m3. After adopting measures such as ventilation of open doors, spraying of air fresheners, and use of negative ion generators, the indoor negative ion concentration increased from 279±22, 292±21, 472±49 to 424±27, 1465±99, and 14153±1222/cm3, respectively. , indicating that the three kinds of measures can significantly improve the air negative ion concentration.