Spatiotemporal Mapping of Ultrafine Particle Fluxes in an Office HVAC System with a Diffusion Charger Sensor Array DOI Creative Commons
Danielle N. Wagner, Nusrat Jung, Brandon E. Boor

et al.

ACS ES&T Air, Journal Year: 2024, Volume and Issue: 2(1), P. 49 - 63

Published: Dec. 17, 2024

Commercial HVAC systems intended to mitigate indoor air pollution are operated based on standards that exclude aerosols with smaller diameters, such as ultrafine particles (UFPs, Dp ≤ 100 nm), which dominate a large proportion of and outdoor number-based particle size distributions. UFPs generated from occupant activities or infiltrating the outdoors can be recirculated accumulate indoors when they not successfully filtered by an handling unit. Monitoring in real occupied environments is vital understanding these source mitigation dynamics, but capturing their rapid transience across multiple locations challenging due high-cost instrumentation. This 9-month field measurement campaign pairs four medium-cost diffusion charger sensors volumetric airflow rates modulated monitored cloud-based building automation system open-plan living laboratory office dedicated unit evaluate spatiotemporal number surface area concentrations migration trends. Particle flux reveal estimated daily median 8 × 1013 enter outdoors. Switching MERV14 HEPA filter reduces supplied room tens trillions daily, increasing filtration efficiency 40% 96%. These results demonstrate efficacy optimal unit's performance improve quality, while highlighting UFP dynamics accounted for current nor occupant-centered control. Scalable sensor development popularize monitoring allow future integration within control platforms. The framework established this used fluxes considering different analytes.

Language: Английский

Spatiotemporal Variations in Ozone and Carbon Dioxide Concentrations in a HVAC System of a LEED-Certified Office Building DOI
Jinglin Jiang, Junkai Huang, Nusrat Jung

et al.

Building and Environment, Journal Year: 2025, Volume and Issue: unknown, P. 112651 - 112651

Published: Jan. 1, 2025

Language: Английский

Citations

0
Carbon capture, utilization and storage in buildings: Analysis of performance, social acceptance, policy measures, and the role of artificial intelligence DOI
Y. Elaouzy, Abdelghafour Zaabout

Building and Environment, Journal Year: 2025, Volume and Issue: 275, P. 112817 - 112817

Published: March 9, 2025

Language: Английский

Citations

0
The Impact of Indoor Environments on the Abundance of Urban Outdoor VOCs DOI
Li Zhou,

Xiaoqiao Jiao,

Bo Yang

et al.

Environmental Science & Technology, Journal Year: 2025, Volume and Issue: unknown

Published: March 10, 2025

With the upcoming transition to clean electric vehicles, sources of volatile organic compounds (VOCs) in ambient environment are rapidly changing and highly uncertain. Here, through systematic characterization emissions from a typical apartment Chinese megacity (Shenzhen), we show that indoor environments contribute significantly levels (i.e., outdoor) VOCs. In particular, observe majority VOCs originate unoccupied spaces, demonstrating temperature-dependent release surface reservoirs. The total indoor-to-outdoor VOC emission rates varied 53 2300 mg day–1 (median 230 day–1) during periods, influenced by both air exchange rate temperature. Reanalysis literature data various building studies worldwide corroborates our findings reveals scale with room volume, an average 0.33 ± 0.03 h–1 m–3. Our study implies urban levels, rivaling traditional sources, e.g., power generation biomass burning. This is particularly true for oxygenated VOCs, such as methanol, amounting ∼60% transportation emissions. change understanding role contributions outdoor quality, whose importance will increase controls on industrial intensify.

Language: Английский

Citations

0
Indoor Emission, Oxidation, and New Particle Formation of Personal Care Product Related Volatile Organic Compounds DOI Creative Commons
Tianren Wu, Tatjana Müller, Nijing Wang

et al.

Environmental Science & Technology Letters, Journal Year: 2024, Volume and Issue: 11(10), P. 1053 - 1061

Published: Aug. 30, 2024

Personal care products (PCPs) contain diverse volatile organic compounds (VOCs) and routine use of PCPs indoors has important implications for indoor air quality human chemical exposures. This chamber study deployed aerosol instrumentation two online mass spectrometers to quantify VOC emissions from the five fragranced examined formation gas-phase oxidation particles upon ozone-initiated reactive VOCs. The tested include a perfume, roll-on deodorant, body spray, hair hand lotion. Indoor these emitted over 200 VOCs resulted in mixing ratios several parts per million. emission factors varied 2 964 mg g

Language: Английский

Citations

2
Methanol and Ethanol in Indoor Environments DOI Creative Commons
William W. Nazaroff, Charles J. Weschler

Indoor Environments, Journal Year: 2024, Volume and Issue: unknown, P. 100049 - 100049

Published: Sept. 1, 2024

Language: Английский

Citations

2
Rapid screening of volatile chemicals in surface water samples from the East Palestine, Ohio chemical disaster site with proton transfer reaction mass spectrometry DOI Creative Commons
Jinglin Jiang, Xiaosu Ding,

Paula Belmont Coelho

et al.

The Science of The Total Environment, Journal Year: 2024, Volume and Issue: 954, P. 176056 - 176056

Published: Sept. 6, 2024

Language: Английский

Citations

1
Spatiotemporal Mapping of Ultrafine Particle Fluxes in an Office HVAC System with a Diffusion Charger Sensor Array DOI Creative Commons
Danielle N. Wagner, Nusrat Jung, Brandon E. Boor

et al.

ACS ES&T Air, Journal Year: 2024, Volume and Issue: 2(1), P. 49 - 63

Published: Dec. 17, 2024

Commercial HVAC systems intended to mitigate indoor air pollution are operated based on standards that exclude aerosols with smaller diameters, such as ultrafine particles (UFPs, Dp ≤ 100 nm), which dominate a large proportion of and outdoor number-based particle size distributions. UFPs generated from occupant activities or infiltrating the outdoors can be recirculated accumulate indoors when they not successfully filtered by an handling unit. Monitoring in real occupied environments is vital understanding these source mitigation dynamics, but capturing their rapid transience across multiple locations challenging due high-cost instrumentation. This 9-month field measurement campaign pairs four medium-cost diffusion charger sensors volumetric airflow rates modulated monitored cloud-based building automation system open-plan living laboratory office dedicated unit evaluate spatiotemporal number surface area concentrations migration trends. Particle flux reveal estimated daily median 8 × 1013 enter outdoors. Switching MERV14 HEPA filter reduces supplied room tens trillions daily, increasing filtration efficiency 40% 96%. These results demonstrate efficacy optimal unit's performance improve quality, while highlighting UFP dynamics accounted for current nor occupant-centered control. Scalable sensor development popularize monitoring allow future integration within control platforms. The framework established this used fluxes considering different analytes.

Language: Английский

Citations

0