Human health has been identified to be affected more significantly by indoor air quality. Among numerous pollutants present in indoor air, formaldehyde (FA) is of great concern because of its highly hazardous nature. The concentrations of FA were determined from 20 newly decorated homes in the city of Gonabad, Iran during 2015. It was found that the indoor air levels of FA in all the sampled houses were exceptionally high in the range of 21 to 360 µg/m³ (mean of 149.3 µg/m³). If the 24-h average concentrations of FA measured from those sites were concerned, nearly 40% of them were seen to exceed the WHO guideline values (i.e., 100 µg/m³). One of the important reasons for the high concentrations could be low air exchange rates in those houses (e.g., from 0.18 to 0.37 h⁻¹), high levels of humidity in the newly decorating houses and stronger sources in the indoor environment. Furthermore, its pollution in homes with natural ventilation was seen to be much higher than those of mechanical ventilation. Due to high levels of indoor FA, more effective control procedures should be developed and employed to reduce the risk associated with formaldehyde exposure.

人们已经确定人类健康会受到室内空气质量的更大影响。在室内空气中存在的多种污染物中，甲醛（FA）由于其极高的危害性而备受关注。在2015年期间，从伊朗Gonabad市的20个新装修房屋中确定了FA的浓度。发现所有采样房屋中的FA的室内空气含量都异常高，范围为21至360 µg / m ^3。（平均值为149.3 µg / m ³）。如果关注从这些站点测得的24小时内FA的平均浓度，则将近40％的FA被视为超过WHO准则值（即100 µg / m ^3）。）。高浓度的重要原因之一可能是这些房屋中的空气交换率低（例如，从0.18到0.37 h ^-1），新装修房屋中的高湿度和室内环境中更强大的源。此外，在自然通风的家庭中，其污染远高于机械通风的家庭。由于室内FA含量较高，应制定更有效的控制程序，并采取减少甲醛暴露的风险。