National Institute of Standards and Technology, Gaithersburg, Maryland, USA.
Indoor Air. 2022 Jul;32(7):e13059. doi: 10.1111/ina.13059.
Indoor carbon dioxide (CO ) concentrations have been considered for decades in evaluating indoor air quality (IAQ) and ventilation, and more recently in discussions of the risk of airborne infectious disease transmission. However, many of these applications reflect a lack of understanding of the connection between indoor CO levels, ventilation, and IAQ. For example, a single indoor concentration such as 1000 ppm is often used as a metric of IAQ and ventilation without an understanding of the significance of this or any other value. CO concentrations are of limited value as IAQ metrics, and a single concentration will not serve as a ventilation indicator for spaces with different occupancies and ventilation requirements. An approach has been developed to estimate a space-specific CO level that can serve as a metric of outdoor ventilation rates. The concept is to estimate the CO concentration that would be expected in a specific space given its intended or expected ventilation rate, the number of occupants, the rate at which they generate CO , and the time that has transpired since the space was occupied. This paper describes the approach and presents example calculations for several commercial, institutional, and residential occupancies.
几十年来，人们一直通过室内二氧化碳 (CO) 浓度来评估室内空气质量 (IAQ) 和通风情况，而最近则更多地讨论了空气传播传染病传播的风险。然而，这些应用中的许多都反映出对室内 CO 水平、通风和室内空气质量之间的联系缺乏了解。例如，室内浓度，例如 1000 ppm，经常被用作室内空气质量和通风的指标，而不了解这个或任何其他值的意义。CO 浓度作为室内空气质量指标的价值有限，对于具有不同占用率和通风要求的空间，单个浓度不会作为通风指标。已经开发出一种方法来估计特定空间的 CO 水平，该水平可作为室外通风率的指标。该概念是根据特定空间的预期或预期通风率、占用人数、他们产生 CO 的速度以及该空间被占用以来经过的时间来估计预期在特定空间中存在的 CO 浓度。本文介绍了该方法，并为几种商业、机构和住宅占用情况提供了示例计算。
