Diel variation of formaldehyde levels and other VOCs in homes driven by temperature dependent infiltration and emission rates

Huangfu, Yibo; Lima, Nathan; O'Keeffe, P.; Kirk, William M.; Lamb, Brian; Pressley, S. N.; Lin, Beiyu; Cook, Diane J.; Walden, Von P.; Jobson, B. T.

doi:10.1016/j.buildenv.2019.05.031

Cited by 27 publications

(23 citation statements)

References 63 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These levels represented a decrease from pre‐retrofit formaldehyde of 39(11) ppb and 38 ppb (ibid). The higher concentrations measured in these studies relative to HENGH could result from sampling occurring only during daytime hours in the summer season, a time at which emissions are expected to be higher than concentrations measured over full diurnal cycles and varied seasons 38 . The lower concentrations in HENGH homes could also result in part from lower emissions resulting from the California air toxic control measure.…”

Section: Resultsmentioning

confidence: 82%

Indoor air quality in California homes with code‐required mechanical ventilation

et al. 2020

View full text Add to dashboard Cite

Data were collected in 70 detached houses built in 2011‐2017 in compliance with the mechanical ventilation requirements of California's building energy efficiency standards. Each home was monitored for a 1‐week period with windows closed and the central mechanical ventilation system operating. Pollutant measurements included time‐resolved fine particulate matter (PM2.5) indoors and outdoors and formaldehyde and carbon dioxide (CO2) indoors. Time‐integrated measurements were made for formaldehyde, NO2, and nitrogen oxides (NOX) indoors and outdoors. Operation of the cooktop, range hood, and other exhaust fans was continuously recorded during the monitoring period. Onetime diagnostic measurements included mechanical airflows and envelope and duct system air leakage. All homes met or were very close to meeting the ventilation requirements. On average, the dwelling unit ventilation fan moved 50% more airflow than the minimum requirement. Pollutant concentrations were similar to or lower than those reported in a 2006‐2007 study of California new homes built in 2002‐2005. Mean and median indoor concentrations were lower by 44% and 38% for formaldehyde and 44% and 54% for PM2.5. Ventilation fans were operating in only 26% of homes when first visited, and the control switches in many homes did not have informative labels as required by building standards.

show abstract

Section: Resultsmentioning

confidence: 82%

Indoor air quality in California homes with code‐required mechanical ventilation

et al. 2020

View full text Add to dashboard Cite

show abstract

“…13,14 In addition to these pollutants, also for example, ultrafine particles (UFPs), volatile organic compounds (VOCs), aldehydes (eg, formaldehyde (HCHO)), ozone (O 3 ), and bioparticles (fungi and bacteria)) could be cause for health effects in some sports facilities. Besides, important comfort parameters-temperature (T) and relative humidity (RH)-may affect for example material emissions [15][16][17] and occupant's perception of the indoor air quality (IAQ) 18 and should be taken into account when evaluating exposure issues in sports facilities.…”

Section: Introductionmentioning

confidence: 99%

Human exposure to air contaminants in sports environments

2020

View full text Add to dashboard Cite

Physical activity is one of the most basic human functions and a significant basis of health. The World Health Organization (WHO) 1 recommends that adults, including older adults, undertake at least 2.5 hours of moderately intense aerobic activity per week. With an increasing number of sports enthusiasts worldwide, the number of indoor sports facilities and the number of workers in those facilities have also increased dramatically in the past decades. However, unlike residential areas and other types of public spaces, such as schools and offices, there is relatively little published research about air quality and exposure to different pollutants in various indoor sports facilities, 2,3 where a growing number of people exercise, work full or part time, or attend athletic events. 4,5 Although many studies of athletes' exposure to ambient air contaminants have been published, 6-10 little work is known about the exposure to air pollutants in different indoor sports facilities. Available publications have been focused on ice arenas, with the most investigated pollutants being carbon monoxide (CO), nitrogen dioxide (NO 2), and particulate matter (PM 10 and PM 2.5 , referring to

show abstract

“…Formaldehyde was substantially lower in the apartments than in the detached houses with the difference statistically significant ( P = .005 based on Mann‐Whitney test). This is an expected result since (a) the apartments were older than the houses and (b) because higher air change rates reduce formaldehyde 31,32 . Building age is important because formaldehyde concentrations decrease substantially over the first few years after a building is constructed 33 and 48 of 70 houses in the HENGH study were measured when they were less than 3 years old.…”

Section: Resultsmentioning

confidence: 88%

“…This is an expected result since (a) the apartments were older than the houses and (b) because higher air change rates reduce formaldehyde. 31,32 Building age is important because formaldehyde concentrations decrease substantially over the first few years after a building is constructed 33 NO 2 concentrations were both substantially and significantly higher inside the apartments than inside the detached houses (P < .01) and also higher outside of the apartments than outside of the houses (P < .01). Mean indoor/outdoor NO 2 concentrations were 20.4/9.8 ppb at Site 1, 18.4/4.6 ppb at Site 2, 14.0/7.9 ppb at Site 3, and 22.0/19.7 ppb at Site 4.…”

Section: Measured Time-integrated Air Pollutantsmentioning

confidence: 99%

Indoor air quality in new and renovated low‐income apartments with mechanical ventilation and natural gas cooking in California

et al. 2020

View full text Add to dashboard Cite

show abstract

Diel variation of formaldehyde levels and other VOCs in homes driven by temperature dependent infiltration and emission rates

Cited by 27 publications

References 63 publications

Indoor air quality in California homes with code‐required mechanical ventilation

Indoor air quality in California homes with code‐required mechanical ventilation

Human exposure to air contaminants in sports environments

Indoor air quality in new and renovated low‐income apartments with mechanical ventilation and natural gas cooking in California

Contact Info

Product

Resources

About