Investigation and modeling of diurnal variation in suburban ambient formaldehyde concentration
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RESEARCH ARTICLE
Investigation and modeling of diurnal variation in suburban ambient formaldehyde concentration Shigeru Taguchi 1 & Moe Hagiwara 1 & Ayumi Shibata 1 & Hiroaki Fujinari 1 & Sayaka Matsumoto 1 & Makoto Kuwata 1 & Kazuto Sazawa 1 & Noriko Hata 1 & Hideki Kuramitz 1 Received: 12 April 2020 / Accepted: 28 October 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Formaldehyde (HCHO) is a naturally occurring compound found in ambient air which can induce cancer and sick-building syndrome. It plays an important role in the formation of OH radicals, which are connected to the formation of various airborne chemicals. Herein, we present a simple modeling for the simulation of diurnal variations in the HCHO concentration of ambient air. This was achieved using data collected during different seasons from November 2015 to March 2017 at a suburban location in Toyama City (Japan), where non-methane hydrocarbon (NMHC) levels were low at sub carbon ppm (ppmC) order. The modeling was based on the assumption that photochemical reactions of methane were the major factor of secondary HCHO formation. The model took into account the production and decomposition of HCHO by photochemical reactions as well as its loss due to other reactions such as dry deposition. Accordingly, the model’s equation contained terms for solar radiation, temperature, and methane concentration. The results predicted using the model showed good agreement with the experimental data observed on fine days, i.e., except rainy, foggy, and heavily cloudy days. The relationships between HCHO concentration and solar radiation/temperature on different days as well as the seasonal variation of HCHO concentration were also interpreted by the proposed model. This study contributes to the evaluation of the pollution levels of formaldehyde. Moreover, the model may be used to demonstrate the impact of increasing methane levels, with regard to global warming and the background levels of HCHO in the atmosphere. Keywords Formaldehyde concentration . Ambient air . Diurnal variation . Modeling
Introduction Formaldehyde (HCHO) is one of the familiar harmful substances that induce cancer and sick-building syndrome (Gamo et al. 2003; Naya and Nakanishi 2005). HCHO is present everywhere in outdoor ambient air (Heikes et al. 2001; Singh et al. 2001; Smidt et al. 2005; Staffelbach et al. 1991; Vrekoussis et al. 2010), and it is produced from both natural and artificial sources (Ishii
Responsible Editor: Gerhard Lammel * Shigeru Taguchi [email protected] * Hideki Kuramitz [email protected] 1
Department of Environmental Biology and Chemistry, Graduate School of Science and Engineering for Research, University of Toyama, Gofuku 3190, Toyama 930-8555, Japan
et al. 2014; Lowe and Schmidt 1983; Tago et al. 2005). Furthermore, HCHO plays an important role in the formation of OH radicals which are connected with the formation of various airborne chemicals (Atkinson 2000: Atkinson et al. 2006; Chatfield et al. 2010; Khwaja and Naran
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