In addition to filtration in heating ventilation and air
conditioning (HVAC) systems, portable filter-based air
cleaners have also been used to reduce indoor levels of
PM2.5 and assess potential impacts of these reductions on
acute health-related biomarkers in controlled experiments.
Macintosh et al. [2008] reported that the PM2.5 can also be
effectively removed with a single portable air cleaner with
HEPA filter (13). Under typical conditions (7), the operation
of a single portable air cleaner with HEPA filter led to a
decrease of I/O ratio from 0.4 to 0.14 (a 65% decrease, 95%
CI: 63-67%). The actual removal rate is expected to be
dependent upon the size of interior space, the ventilation rate,
and the flow rate of the portable air cleaner. Bräuner et al.
[2008] conducted a randomized double-blind, crossover
study to quantify the impact of a portable HEPA filter-based
indoor air intervention on microvascular function for healthy
elderly individuals in Copenhagen (15). The HEPA filter
intervention reduced both indoor PM2.5 mass concentrations
(from 12.6 to 4.7 μg/m3) and particle number concentrations
(from 10,016 to 3,206 particles/cm3), leading to an 8.1%
(95% CI: 0.4-26.3% improvement in microvascular
function. Another study in an area with prevalent wood
smoke (Vancouver, BC area) used a similar HEPA filter
intervention and reported similar declines in indoor PM
levels as well as improved microvascular function (16).
In addition to filtration in heating ventilation and airconditioning (HVAC) systems, portable filter-based aircleaners have also been used to reduce indoor levels ofPM2.5 and assess potential impacts of these reductions onacute health-related biomarkers in controlled experiments.Macintosh et al. [2008] reported that the PM2.5 can also beeffectively removed with a single portable air cleaner withHEPA filter (13). Under typical conditions (7), the operationof a single portable air cleaner with HEPA filter led to adecrease of I/O ratio from 0.4 to 0.14 (a 65% decrease, 95%CI: 63-67%). The actual removal rate is expected to bedependent upon the size of interior space, the ventilation rate,and the flow rate of the portable air cleaner. Bräuner et al.[2008] conducted a randomized double-blind, crossoverstudy to quantify the impact of a portable HEPA filter-basedindoor air intervention on microvascular function for healthyelderly individuals in Copenhagen (15). The HEPA filterintervention reduced both indoor PM2.5 mass concentrations(from 12.6 to 4.7 μg/m3) and particle number concentrations(from 10,016 to 3,206 particles/cm3), leading to an 8.1%(95% CI: 0.4-26.3% improvement in microvascularfunction. Another study in an area with prevalent woodsmoke (Vancouver, BC area) used a similar HEPA filterintervention and reported similar declines in indoor PMlevels as well as improved microvascular function (16).
การแปล กรุณารอสักครู่..
