Edinburgh Research Explorer

Temporal persistence of intra-urban spatial contrasts in ambient NO2, O3 and Ox in Edinburgh, UK

Research output: Contribution to journalArticle

Related Edinburgh Organisations

Open Access permissions



Original languageEnglish
Pages (from-to)734-741
Number of pages8
JournalAtmospheric Pollution Research
Issue number4
Early online date19 Apr 2016
Publication statusPublished - Jul 2016


Ambient NO2, O3 and Ox (the sum of NO2 and O3) are associated with adverse health outcomes. Quantitative assessment of the health burden from these pollutants requires knowledge of small-scale variations in their concentrations in urban environments. In particular, we were interested in the temporal stability of intra-urban spatial contrasts in these pollutants. This was investigated by concurrent measurements of NO2 and O3 by passive samplers at 30 sites in Edinburgh, UK, repeated 12  1-weekly for NO2 and 6  2-weekly for O3 in summer and winter. Temporally persistent and large spatial variations in both NO2 and O3 concentrations were observed. Concentrations of NO2 across the sites ranged on average by a factor 14 between suburban parks and heavily-trafficked roadsides, corresponding to a difference in NO2 on average of ~80 µg m-3. Intra-urban O3 concentrations also varied substantially, on average by a factor of 4 (average range 45 µg m-3) and with strong anticorrelation to NO2 concentrations across the 30 sites. Consequently intra-urban variability was considerably lower for Ox than for NO2 and O3. The temporal stability in relative NO2 and O3 concentrations indicate potential for deriving intra-urban spatial fields of NO2 and O3 at different times by scaling models of long-term spatial patterns of NO2 and O3 by the measurements at a single site. If Ox is a key determinant of adverse health then the large intra-urban spatial contrasts in NO2 and O3 may be less relevant, with Ox concentrations across an urban area determined at a suitable background site.

    Research areas

  • air quality, NO2, O3, ozone, passive diffusion tube, INTRAURBAN VARIATIONS

Download statistics

No data available

ID: 25057422