Analysis of the air pollution climate at a central urban background site

Research output: Contribution to journalArticle

Standard

Analysis of the air pollution climate at a central urban background site. / Bigi, A; Harrison, Roy.

In: Atmospheric Environment, Vol. 44, 01.01.2010, p. 2004-2012.

Research output: Contribution to journalArticle

Harvard

APA

Vancouver

Author

Bibtex

@article{2a9026ce080a414da5796cadea709ba1,
title = "Analysis of the air pollution climate at a central urban background site",
abstract = "Measurements of air pollutants from a background site in central London are analysed. These comprise hourly data for CO, NO, NO2, O-3, SO2 and PM10 from 1996 to 2008 and particle number count from 2001 to 2008. The data are analysed in terms of long-term trends, annual, weekly and diurnal cycles, and autocorrelation and cross-correlation functions. CO, NO and NO2 show a typical traffic-associated pattern with two daily peaks and lesser concentrations at the weekend Particle number count and PM10 show a similar cycle, but with smaller amplitude. Ozone has an annual cycle with a maximum in May, influenced by the spring maximum in background ozone, but the diurnal and weekly cycles are dominated by losses through reaction with nitric oxide. Particle number count shows a minimum corresponding with maximum air temperatures in August, whereas the CO, NO NO2 and SO2 show a minimum in June/July. There is a lower particle count to NOx ratio at the background site compared to a central London kerbside site (Marylebone Road) and a seasonal pattern in particle count to NOx and PM10 ratios consistent with loss of nanoparticles by evaporation during atmospheric transport. Sulphur dioxide peaks in the morning in summer, but at midday in winter consistent with emissions from elevated sources mixing down from aloft as the diurnal mixed layer deepens. Implications for epidemiological studies of air quality and health are discussed Sulphur dioxide, carbon monoxide, nitric oxide and nitrogen dioxide show clear downward trends over the measurement period. PM10 declines initially before levels stabilised, and ozone concentrations increased (C) 2010 Elsevier Ltd. All rights reserved",
keywords = "Air pollution, Pollution climates, Nanoparticles, Urban background, London",
author = "A Bigi and Roy Harrison",
year = "2010",
month = jan,
day = "1",
doi = "10.1016/j.atmosenv.2010.02.028",
language = "English",
volume = "44",
pages = "2004--2012",
journal = "Atmospheric Environment",
issn = "1352-2310",
publisher = "Elsevier",

}

RIS

TY - JOUR

T1 - Analysis of the air pollution climate at a central urban background site

AU - Bigi, A

AU - Harrison, Roy

PY - 2010/1/1

Y1 - 2010/1/1

N2 - Measurements of air pollutants from a background site in central London are analysed. These comprise hourly data for CO, NO, NO2, O-3, SO2 and PM10 from 1996 to 2008 and particle number count from 2001 to 2008. The data are analysed in terms of long-term trends, annual, weekly and diurnal cycles, and autocorrelation and cross-correlation functions. CO, NO and NO2 show a typical traffic-associated pattern with two daily peaks and lesser concentrations at the weekend Particle number count and PM10 show a similar cycle, but with smaller amplitude. Ozone has an annual cycle with a maximum in May, influenced by the spring maximum in background ozone, but the diurnal and weekly cycles are dominated by losses through reaction with nitric oxide. Particle number count shows a minimum corresponding with maximum air temperatures in August, whereas the CO, NO NO2 and SO2 show a minimum in June/July. There is a lower particle count to NOx ratio at the background site compared to a central London kerbside site (Marylebone Road) and a seasonal pattern in particle count to NOx and PM10 ratios consistent with loss of nanoparticles by evaporation during atmospheric transport. Sulphur dioxide peaks in the morning in summer, but at midday in winter consistent with emissions from elevated sources mixing down from aloft as the diurnal mixed layer deepens. Implications for epidemiological studies of air quality and health are discussed Sulphur dioxide, carbon monoxide, nitric oxide and nitrogen dioxide show clear downward trends over the measurement period. PM10 declines initially before levels stabilised, and ozone concentrations increased (C) 2010 Elsevier Ltd. All rights reserved

AB - Measurements of air pollutants from a background site in central London are analysed. These comprise hourly data for CO, NO, NO2, O-3, SO2 and PM10 from 1996 to 2008 and particle number count from 2001 to 2008. The data are analysed in terms of long-term trends, annual, weekly and diurnal cycles, and autocorrelation and cross-correlation functions. CO, NO and NO2 show a typical traffic-associated pattern with two daily peaks and lesser concentrations at the weekend Particle number count and PM10 show a similar cycle, but with smaller amplitude. Ozone has an annual cycle with a maximum in May, influenced by the spring maximum in background ozone, but the diurnal and weekly cycles are dominated by losses through reaction with nitric oxide. Particle number count shows a minimum corresponding with maximum air temperatures in August, whereas the CO, NO NO2 and SO2 show a minimum in June/July. There is a lower particle count to NOx ratio at the background site compared to a central London kerbside site (Marylebone Road) and a seasonal pattern in particle count to NOx and PM10 ratios consistent with loss of nanoparticles by evaporation during atmospheric transport. Sulphur dioxide peaks in the morning in summer, but at midday in winter consistent with emissions from elevated sources mixing down from aloft as the diurnal mixed layer deepens. Implications for epidemiological studies of air quality and health are discussed Sulphur dioxide, carbon monoxide, nitric oxide and nitrogen dioxide show clear downward trends over the measurement period. PM10 declines initially before levels stabilised, and ozone concentrations increased (C) 2010 Elsevier Ltd. All rights reserved

KW - Air pollution

KW - Pollution climates

KW - Nanoparticles

KW - Urban background

KW - London

U2 - 10.1016/j.atmosenv.2010.02.028

DO - 10.1016/j.atmosenv.2010.02.028

M3 - Article

VL - 44

SP - 2004

EP - 2012

JO - Atmospheric Environment

JF - Atmospheric Environment

SN - 1352-2310

ER -