Human ammonia emission rates under various indoor environmental conditions

Mengze Li, Charles J. Weschler*, Gabriel Bekö, Pawel Wargocki, Gregor Lucic

*Corresponding author for this work

Research output: Contribution to conferencePaperResearchpeer-review

Abstract

Ammonia (NH3) is typically measured at mixing ratios of 50 parts per trillion (ppt) to 5 parts per billion (ppb) in outside air, while its mixing ratios are approximately an order of magnitude larger indoors. In both outdoor and indoor environments, NH3 is the dominant basic species. High NH3 concentrations (> 25 ppm) are associated with adverse health effects.
Considering that humans spend more than 90% of their life in indoor environments, coupled with the strong impact that NH3 has on indoor acid-base processes (Nazaroff and Weschler, 2020), it is important to determine the rates and predominant driving factors for indoor NH3 emissions from humans beings which are potent mobile sources. In this study, we have assessed human NH3 emission rates (from whole body, from skin, from breath) as a function of temperature, clothing (skin coverage), age, relative humidity and ozone levels. Real-time measurements were made with five groups each consisting of four healthy individuals, housed within a controlled climate chamber, using a cavity ringdown spectrometer. This study is part of the Indoor Chemical Human Emissions and Reactivity (ICHEAR) project.
Original languageEnglish
Publication date2020
Number of pages3
Publication statusPublished - 2020
Event 16th Conference of the International Society of Indoor Air Quality & Climate - Online
Duration: 1 Nov 20204 Nov 2020
Conference number: 16

Conference

Conference 16th Conference of the International Society of Indoor Air Quality & Climate
Number16
LocationOnline
Period01/11/202004/11/2020

Bibliographical note

Paper ID ABS-0086

Keywords

  • Breath
  • Dermal
  • Indoor exposure
  • Acid-base chemistry
  • Exposed skin

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