当前位置： SCI文献检索 > ENVIRONMENT INTERNATIONAL期刊下所有文献 > Variability in exposure to ambient ultrafine particles in urban schools: Comparative assessment between Australia and Spain.

Variability in exposure to ambient ultrafine particles in urban schools: Comparative assessment between Australia and Spain.

Abstract：

:Ambient ultrafine particle number concentrations (PNC) have inhomogeneous spatio-temporal distributions and depend on a number of different urban factors, including background conditions and distant sources. This paper quantitatively compares exposure to ambient ultrafine particles at urban schools in two cities in developed countries, with high insolation climatic conditions, namely Brisbane (Australia) and Barcelona (Spain). The analysis used comprehensive indoor and outdoor air quality measurements at 25 schools in Brisbane and 39 schools in Barcelona. PNC modes were analysed with respect to ambient temperature, land use and urban characteristics, combined with the measured elemental carbon concentrations, NOx (Brisbane) and NO2 (Barcelona). The trends and modes of the quantified weekday average daily cycles of ambient PNC exhibited significant differences between the two cities. PNC increases were observed during traffic rush hours in both cases. However, the mid-day peak was dominant in Brisbane schools and had the highest contribution to total PNC for both indoors and outdoors. In Barcelona, the contribution from traffic was highest for ambient PNC, while the mid-day peak had a slightly higher contribution for indoor concentrations. Analysis of the relationships between PNC and land use characteristics in Barcelona schools showed a moderate correlation with the percentage of road network area and an anti-correlation with the percentage of green area. No statistically significant correlations were found for Brisbane. Overall, despite many similarities between the two cities, school-based exposure patterns were different. The main source of ambient PNC at schools was shown to be traffic in Barcelona and mid-day new particle formation in Brisbane. The mid-day PNC peak in Brisbane could have been driven by the combined effect of background and meteorological conditions, as well as other local/distant sources. The results have implications for urban development, especially in terms of air quality mitigation and management at schools.

journal_name

Environ Int

journal_title

Environment international

authors

Mazaheri M,Reche C,Rivas I,Crilley LR,Álvarez-Pedrerol M,Viana M,Tobias A,Alastuey A,Sunyer J,Querol X,Morawska L

doi

10.1016/j.envint.2015.12.029

subject

Has Abstract

pub_date

2016-03-01 00:00:00

pages

142-149

eissn

0160-4120

issn

1873-6750

pii

S0160-4120(15)30133-1

journal_volume

pub_type

杂志文章

在线工具

Variability in exposure to ambient ultrafine particles in urban schools: Comparative assessment between Australia and Spain.