Urban NO2 concentrations in the U.K. in 1987

Bower, J.S.; Broughton, G.F.J.; Dando, M.T.; Lees, Andrew; Stevenson, Ken; Lampert, J.E.; Sweeney, B P; Parker, V.J; Driver, G S; Waddon, C.J.; Wood, A.J

doi:10.1016/0957-1272(91)90062-j

Cited by 12 publications

(5 citation statements)

References 6 publications

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“…Maximum daily concentrations were mostly above 100 µg/m 3 (maximum 169 µg/m 3 ) at Site 1, and between 40 and 90 µg/m 3 at Site 2. Annual means of NO 2 at urban Site 1 were in the range of the corresponding values observed in 1987 in some U.K. cities (except London), while maximum daily concentrations were several times lower than the maxima observed in the U.K. [11]. The obtained yearly averages at both sites are in the range of the ambient levels of NO 2 observed in Denmark.…”

Section: Nitrogen Dioxidesupporting

confidence: 55%

“…The obtained yearly averages at both sites are in the range of the ambient levels of NO 2 observed in Denmark. While no difference in NO 2 for the summer and winter results were obtained in Denmark [12], the winter results were found to be higher in Great Britain [11]. During the last 5 years of survey (Table 1), seasonal variations are visible only once at Site 1, presumably due to dominant traffic emissions from the nearby busy street, and in 3 of 5 years at Site 2.…”

Section: Nitrogen Dioxidementioning

confidence: 87%

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Airborne Ns (NO₂and NH₃) in the Rijeka Bay Area (Croatia), 1980–1995

Alebić-Juretić¹

2001

The Scientific World JOURNAL

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Section: Nitrogen Dioxidesupporting

confidence: 55%

Section: Nitrogen Dioxidementioning

confidence: 87%

Airborne Ns (NO₂and NH₃) in the Rijeka Bay Area (Croatia), 1980–1995

Alebić-Juretić¹

2001

The Scientific World JOURNAL

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“…W/S concentration ratios ranged from 0.72 to 1.44 for NO 2 (with a mean value of 1.05), and from 0.65 to 1.68 for NO (with a mean value of 1.15). According to Bower et al (1991), the measured NO 2 /NO x ratio is a convenient variable of the extent and completeness of atmospheric oxidation processes. The annual NO 2 /NO x ratio was approximately 0.68, with a minimum of 0.66 in December and a maximum of 0.71 in June.…”

Section: Seasonal Pollutant Variationsmentioning

confidence: 99%

Multivariate Statistical Analysis of Meteorological and Air Pollution Data in the ‘Campo De Gibraltar’ Region, Spain

Gallero

Vallejo

Umbría

et al. 2006

Environ Monit Assess

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A complete statistical analysis of meteorological and air pollution data was carried out in the 'Campo de Gibraltar' region (in the South of Spain) from 1999 to 2002. This is a heavy industrialized area where, up to date, very few air pollution studies have been made. The main objectives of the study presented here have been the characterization of the meteorological and (gaseous and particulate) air pollution conditions in the area, and the relations between them. Multivariate statistical techniques, such as Principal Component Analysis (PCA), have been applied to the data. The results show that air quality in the area is highly dependent on meteorological conditions such as wind persistence and direction, dispersion capability of the atmosphere, and humidity content. On average, sulphur dioxide and nitrogen oxide air pollution, mainly caused by fuel-oil combustion and traffic, respectively, is not very high. However, an important number of exceedences of the limits established by the EU Directive 1999 for PM10 (particulate matter with a diameter less than 10 microm) have been observed in some points of the area. A significant percentage of these exceedences (about 22% on average) are likely caused by African dust intrusions, which usually take place from May to August. From gaseous and particulate air correlations, it seems that anthropogenic activities contribute with about 19% on average.

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“…NO is a primary pollutant from combustion, so it is present at higher concentrations in large urban centers. In contrast, NO X in rural areas may have been transported from an urban source, over which time the NO photolyzes and reacts with O 3 and OH to form NO 2 (Bower et al 1991). This would also cause a time lag in the peak for rural NO 2 relative to urban NO 2 , which we observe in the morning, but not the afternoon (figure 1(a)).…”

Section: Diurnal Cycle Of Nomentioning

confidence: 75%

Evaluating current satellite capability to observe diurnal change in nitrogen oxides in preparation for geostationary satellite missions

Penn

Holloway

2020

Environ. Res. Lett.

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This study characterizes the degree to which current polar-orbiting satellites can evaluate the daytime change in NO 2 vertical column density (VCD) in urban, suburban, and rural areas. We examine these issues by considering the diurnal cycle of NO 2 over the United States, using the large NO 2 monitoring network supported by states, tribes, and the US Environmental Protection Agency (EPA). Through this analysis, we identify the potential opportunities and limitations of current space-based NO 2 data in capturing diurnal change. Ground-based monitoring data from the US EPA are compared with satellite retrievals of NO 2 from the KNMI Tropospheric Emissions Monitoring Internet Service (TEMIS) for two instruments: GOME-2 with a mid-morning overpass, and OMI with an early afternoon overpass. Satellite data show evidence of higher morning NO 2 in the vicinity of large urban areas. Both satellites and ground monitors show ∼1.5-2x greater NO 2 abundance between morning and afternoon in urban areas. Despite differences in horizontal resolution and overpass time, the two satellite retrievals show similar agreement with ground-based NO 2 measurements. When analyzed on a pixel-by-pixel basis, we find evidence for spatial structure in the diurnal change in NO 2 between city center and surrounding areas in Southern California. Wider analysis of urban-suburban structure in diurnal NO 2 change is hindered by resolution differences in the two satellite instruments, which have the potential to create data artefacts. This study highlights the value of future geostationary instruments to provide comparable satellite retrievals for NO 2 over the course of a day, and research needs related to the effective utilization of NO 2 satellite data for air quality applications.

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Urban NO2 concentrations in the U.K. in 1987

Cited by 12 publications

References 6 publications

Airborne Ns (NO₂and NH₃) in the Rijeka Bay Area (Croatia), 1980–1995

Airborne Ns (NO₂and NH₃) in the Rijeka Bay Area (Croatia), 1980–1995

Multivariate Statistical Analysis of Meteorological and Air Pollution Data in the ‘Campo De Gibraltar’ Region, Spain

Evaluating current satellite capability to observe diurnal change in nitrogen oxides in preparation for geostationary satellite missions

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Urban NO2 concentrations in the U.K. in 1987

Cited by 12 publications

References 6 publications

Airborne Ns (NO2and NH3) in the Rijeka Bay Area (Croatia), 1980–1995

Airborne Ns (NO2and NH3) in the Rijeka Bay Area (Croatia), 1980–1995

Multivariate Statistical Analysis of Meteorological and Air Pollution Data in the ‘Campo De Gibraltar’ Region, Spain

Evaluating current satellite capability to observe diurnal change in nitrogen oxides in preparation for geostationary satellite missions

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Airborne Ns (NO₂and NH₃) in the Rijeka Bay Area (Croatia), 1980–1995

Airborne Ns (NO₂and NH₃) in the Rijeka Bay Area (Croatia), 1980–1995