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Cotte, Hélène; Devaux, C.; Carlier, P.

doi:10.1023/a:1005763127365

Cited by 22 publications

(1 citation statement)

References 17 publications

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“…Since the photolysis frequencies were measured at the same location as the OH measurements, this model should simulate the concentration of OH near the window rather than a household average. To account for heterogeneity in photolysis with direct and indirect light coming in through windows (in addition to artificial light), the measured photolysis frequencies under indirect light were doubled in the model, similar to that done previously. , As a result, the modeled OH concentrations during periods of indirect light (i.e., before 15:00) represent an upper limit. To account for transport between the indoor and outdoor environments, a loss pathway with a rate equal to the air change rate of the house (approximately 0.5 h –1 ) was applied to all chemical species in the model.…”

Section: Experimental Methodsmentioning

confidence: 99%

Measurements of Hydroxyl Radical Concentrations during Indoor Cooking Events: Evidence of an Unmeasured Photolytic Source of Radicals

Reidy

Bottorff

Rosales

et al. 2023

Environ. Sci. Technol.

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The hydroxyl radical (OH) is the dominant oxidant in the outdoor environment, controlling the lifetimes of volatile organic compounds (VOCs) and contributing to the growth of secondary organic aerosols. Despite its importance outdoors, there have been relatively few measurements of the OH radical in indoor environments. During the House Observations of Microbial and Environmental Chemistry (HOMEChem) campaign, elevated concentrations of OH were observed near a window during cooking events, in addition to elevated mixing ratios of nitrous acid (HONO), VOCs, and nitrogen oxides (NO X ). Particularly high concentrations were measured during the preparation of a traditional American Thanksgiving dinner, which required the use of a gas stove and oven almost continually for 6 h. A zero-dimensional chemical model underpredicted the measured OH concentrations even during periods when direct sunlight illuminated the area near the window, which increases the rate of OH production by photolysis of HONO. Interferences with measurements of nitrogen dioxide (NO2) and ozone (O3) suggest that unmeasured photolytic VOCs were emitted during cooking events. The addition of a VOC that photolyzes to produce peroxy radicals (RO2), similar to pyruvic acid, into the model results in better agreement with the OH measurements. These results highlight our incomplete understanding of the nature of oxidation in indoor environments.

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Section: Experimental Methodsmentioning

confidence: 99%

Measurements of Hydroxyl Radical Concentrations during Indoor Cooking Events: Evidence of an Unmeasured Photolytic Source of Radicals

Reidy

Bottorff

Rosales

et al. 2023

Environ. Sci. Technol.

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Measurement of Photolysis Frequencies in the Atmosphere

Hofzumahaus¹

2006

Analytical Techniques for Atmospheric Measurement

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Measurements of the HONO photodissociation constant

2006

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Measurements of the photodissociation constant for nitrous acid (jHONO) were made at an urban site in Toronto, Canada, during the months of May-July 2005, using an optically thin actinometer. Operating details of the jHONO monitor are reported, along with laboratory tests. Measurements of jHONO were obtained for solar zenith angles ranging from 20-75 0 , under clear and cloudy skies. Maximum error estimates on jHONO under clear skies range from 11 % at sunrise, to 4% at solar noon, with a minimum detection limit of 5.7 x 10-4 /sec for our actinometer. Measured clear-sky values of jHONO were compared with values calculated by a four-stream discrete ordinate radiative transfer (RT) model (ACD TUV version 4.1), and were found to be within better than 10% agreement for solar zenith angles <65 0 • For conditions of scattered cloud, enhancement and suppression of the jHONO values occurred by as much as 16%-70%, and 59%-80%, respectively. The integrated band area of the mr* transition for gas-phase nitrous acid yields an oscillator strength, f = (1.06 ± 0.044) x 10-3 (based on clear-sky data), 19.1 % higher than the value reported by Bongartz et al. (1991).

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Cited by 22 publications

References 17 publications

Measurements of Hydroxyl Radical Concentrations during Indoor Cooking Events: Evidence of an Unmeasured Photolytic Source of Radicals

Measurements of Hydroxyl Radical Concentrations during Indoor Cooking Events: Evidence of an Unmeasured Photolytic Source of Radicals

Measurement of Photolysis Frequencies in the Atmosphere

Measurements of the HONO photodissociation constant

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