Verhoeff A P, van der Velde H C, Boleij J S, Lebret E, Brunekreef B
Int Arch Occup Environ Health. 1983;53(2):167-73. doi: 10.1007/BF00378429.
CO levels in exhaled breath were measured in 29 residents of flats, equipped with a flueless geiser (an instantaneous gas-fired water heater). The flats were selected because they had a geiser with a CO concentration of more than 250 parts per million in its flue gases. Small, but in some cases statistically significant increases in CO levels in exhaled breath were found in both smokers and non smokers, and after periods of cooking and dishwashing when the geisers had been used. Calculated COHb levels remained well below 2.5% for non smokers, but were generally higher for smokers.
对29户装有无通风口热水器（即即热式燃气热水器）的公寓住户的呼出气体中的一氧化碳（CO）水平进行了测量。选择这些公寓是因为其热水器烟道气中的一氧化碳浓度超过百万分之250。研究发现，吸烟者和不吸烟者在使用热水器进行烹饪和洗碗一段时间后，呼出气体中的一氧化碳水平均有小幅上升，在某些情况下具有统计学意义。对于不吸烟者，计算得出的碳氧血红蛋白（COHb）水平仍远低于2.5%，但吸烟者的该水平通常更高。
