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611425 occurrences (No.13 in the rank) during 5 years in the PubMed. [cache]

399) With ozone present, OH reactivity nearly doubled, with the increase being mainly caused by dermal emissions of mostly carbonyl compounds (57%).

--- ABSTRACT ---

PMID:33295177 DOI:10.1021/acs.est.0c04206

2021 Environmental science & technology

* Total OH Reactivity of Emissions from Humans: In Situ Measurement and Budget Analysis.

- Humans are a potent, mobile source of various volatile organic compounds (VOCs) in indoor environments. Such direct anthropogenic emissions are gaining importance, as those from furnishings and building materials have become better regulated and energy efficient homes may reduce ventilation. While previous studies have characterized human emissions in indoor environments, the question remains whether VOCs remain unidentified by current measuring techniques. In this study conducted in a climate chamber occupied by four people, the total OH reactivity of air was quantified, together with multiple VOCs measured by proton transfer reaction time-of-flight mass spectrometry (PTR-ToF-MS) and fast gas chromatography-mass spectrometry (fast-GC-MS). Whole-body, breath, and dermal emissions were assessed. The comparison of directly measured OH reactivity and that of the summed reactivity of individually measured species revealed no significant shortfall. Ozone exposure (37 ppb) was found to have little influence on breath OH reactivity but enhanced dermal OH reactivity significantly. Without ozone, the whole-body OH reactivity was dominated by breath emissions, mostly isoprene (76%). With ozone present, OH reactivity nearly doubled, with the increase being mainly caused by dermal emissions of mostly carbonyl compounds (57%). No significant difference in total OH reactivity was observed for different age groups (teenagers/young adults/seniors) without ozone. With ozone present, the total OH reactivity decreased slightly with increasing age.

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--- WordNet output for increase --- =>大きくなる, を増す, 増大させる, 強まる, 増加, 増える, 増やす Overview of noun increase The noun increase has 5 senses (first 5 from tagged texts) 1. (49) addition, increase, gain -- (a quantity that is added; "there was an addition to property taxes this year"; "they recorded the cattle's gain in weight over a period of weeks") 2. (21) increase -- (a change resulting in an increase; "the increase is scheduled for next month") 3. (7) increase, increment, growth -- (a process of becoming larger or longer or more numerous or more important; "the increase in unemployment"; "the growth of population") 4. (3) increase, increment -- (the amount by which something increases; "they proposed an increase of 15 percent in the fare") 5. (3) increase, step-up -- (the act of increasing something; "he gave me an increase in salary") Overview of verb increase The verb increase has 2 senses (first 2 from tagged texts) 1. (86) increase -- (become bigger or greater in amount; "The amount of work increased") 2. (61) increase -- (make bigger or more; "The boss finally increased her salary"; "The university increased the number of students it admitted") --- WordNet end ---