Relationships of outdoor and indoor ultrafine particles at residences downwind of a major international border crossing in Buffalo, NY

McAuley, Timothy; Fisher, R. L.; Zhou, Xiaolu; Jaques, Paul F.; Ferro, A.

doi:10.1111/j.1600-0668.2010.00654.x

Cited by 23 publications

(13 citation statements)

References 41 publications

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“…A slightly higher I/O characterized PM1 (0.66 AE 0.12 as average over the two campaigns) compared with PM2.5 (0.62 AE 0.14), as foreseen by previous studies (Hussein et al, 2005;McAuley et al, 2010). Fig.…”

Section: Indooreoutdoor Relationship Of Pm Mass Concentrationsupporting

confidence: 77%

Indoor airborne particle sources and semi-volatile partitioning effect of outdoor fine PM in offices

Sangiorgi

Ferrero

Ferrini

et al. 2013

Atmospheric Environment

118

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To date, few studies have focused on PM air quality in offices, despite the fact that a lot of people spend\ud many working hours a day in such offices. The aim of the present study is to investigate PM1 and PM2.5\ud in offices in Milan (Northern Italy) and in the air outside those offices. The PM samples were analyzed to\ud determine the entity of certain compounds with possible direct or indirect adverse effects on human\ud health: PAHs, BpA, and water soluble inorganic ions.\ud A good correlation between outdoor and indoor PM mass concentrations emerged (R2 w0.87). The\ud maximum I/O concentration ratiowas 0.92, suggesting that the indoor PM levelwas always lower than the\ud outdoor level. The average infiltration factor, FINF,was 0.55, showing that about a half of the outdoor PMhad\ud come indoors. The indoor-generated particles, Cig, had values ranging from 0 to 4.4 mg m3 (<25% of the\ud indoor PM), showing that PM indoor sources had only made a limited contribution to total indoor PM.\ud The results of the indoor-to-outdoor comparisons for the aforementioned chemical compounds\ud demonstrate that the offices were characterized by the absence of effective indoor sources of particulatebound\ud PAHs and inorganic ions, whereas Cig was around 58% of the indoor concentration for BpA. Our\ud analysis of the FINF data pointed to the presence of a volatilization effect from PM for semi-volatile\ud compounds like ammonium nitrate and 4- or 5-ring PAHs, which affected the measurement of their\ud FINF. We propose the introduction of a new and simple parameter, called volatilization correction, to take\ud account of this effect

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Section: Indooreoutdoor Relationship Of Pm Mass Concentrationsupporting

confidence: 77%

Indoor airborne particle sources and semi-volatile partitioning effect of outdoor fine PM in offices

Sangiorgi

Ferrero

Ferrini

et al. 2013

Atmospheric Environment

118

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“…3e8 indicate a strong influence by the outdoor particulate matter indoors both in terms of number and mass concentration, when no major indoor source was present. Numerous studies have already highlighted the contribution from outdoor sources to indoor number and mass concentration [4,22,36,37,41,49,50]. In general, indoor particles both for number and for mass concentration data presented temporal fluctuations similar to the ones observed outdoors.…”

Section: Influence Of Indoor/outdoor Sourcesmentioning

confidence: 72%

Indoor/outdoor particulate matter number and mass concentration in modern offices

Chatoutsidou

Ondráček

Tesař

et al. 2015

Building and Environment

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a b s t r a c tIndoor/Outdoor (I/O) particulate mass concentration (PM 10 ) and number concentrations were measured online in modern office environments with mechanical ventilation. The measurement took place during June 2014 in a building, which, belongs to the Norwegian Institute for Air Research, in Norway. Particle number size distribution was measured with an SMPS (0.014e0.7 mm) and an APS (0.5e18 mm) instruments, whereas, mass concentration was measured with a Dust-Trak II photometer. Two offices were selected to examine the outdoor contribution of particles and the influence of indoor sources. One office was fully occupied during working hours and the second one unoccupied at all times. The results suggested that human presence during the working hours affected considerably indoor particles in the occupied office both in terms of number and mass concentration compared to the non-working hours conditions. In the absence of any significant indoor source generating new particles (hardcopy devices), the indoor environment was influenced mainly from the presence of people with resuspension activities being the most important source for particle sizes larger than 1 mm. Moreover, indoor particle number and mass concentration was influenced substantially from outdoor sources. Generally, both indoor number and mass concentrations showed temporal fluctuations similar to those observed outdoors, suggesting that particle penetration was significant in both offices. However, low I/O ratio (90 th percentile < 0.3 for both offices) indicated the efficient removal of particles from the air filtration system.

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“…Sixteen studies reporting a total of 201 PSDs were selected for analysis through this procedure. [59][60][61][62][63][64][65][66][67][68][69][70][71][72][73][74] Most of these studies (a) occurred in various European cities (with a few in the United States and Asia), (b) measured size-resolved particle number concentrations in the range of 10 nm to 1000 nm, and (c) reported their results graphically in terms of dN/dlogD p versus the log of particle size, D p .…”

Section: Mapping To Indoor Particle Size Distributionsmentioning

confidence: 99%

Fine and ultrafine particle removal efficiency of new residential HVAC filters

2019

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Particle air filters used in central residential forced‐air systems are most commonly evaluated for their size‐resolved removal efficiency for particles 0.3‐10 µm using laboratory tests. Little information exists on the removal efficiency of commercially available residential filters for particles smaller than 0.3 µm or for integral measures of mass‐based aerosol concentrations (eg, PM2.5) or total number concentrations (eg, ultrafine particles, or UFPs) that are commonly used in regulatory monitoring and building measurements. Here, we measure the size‐resolved removal efficiency of 50 new commercially available residential HVAC filters installed in a recirculating central air‐handling unit in an unoccupied apartment unit using alternating upstream/downstream measurements with incense and NaCl as particle sources. Size‐resolved removal efficiencies are then used to estimate integral measures of PM2.5 and total UFP removal efficiency for the filters assuming they are challenged by 201 residential indoor particle size distributions (PSDs) gathered from the literature. Total UFP and PM2.5 removal efficiencies generally increased with manufacturer‐reported filter ratings and with filter thickness, albeit with numerous exceptions. PM2.5 removal efficiencies were more influenced by the assumption for indoor PSD than total UFP removal efficiencies. Filters with the same ratings but from different manufacturers often had different removal efficiencies for PM2.5 and total UFPs.

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Relationships of outdoor and indoor ultrafine particles at residences downwind of a major international border crossing in Buffalo, NY

Cited by 23 publications

References 41 publications

Indoor airborne particle sources and semi-volatile partitioning effect of outdoor fine PM in offices

Indoor airborne particle sources and semi-volatile partitioning effect of outdoor fine PM in offices

Indoor/outdoor particulate matter number and mass concentration in modern offices

Fine and ultrafine particle removal efficiency of new residential HVAC filters

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