Urban air pollution in megacities of the world

Mage, David T.; Ozolins, Guntis; Peterson, P. J.; Webster, A L; Orthofer, Rudi; Vandeweerd, Veerle; Gwynne, M. D.

doi:10.1016/1352-2310(95)00219-7

Cited by 368 publications

(206 citation statements)

References 3 publications

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“…Atmospheric pollutants considerably affect human health; they are responsible for a variety of respiratory and cardiovascular diseases and are known to cause cancer if humans are exposed to them for extended periods of time [1]. Additionally, air pollution is responsible for environmental problems, such as eutrophication and acidification of ecosystems.…”

Section: Introductionmentioning

confidence: 99%

Deriving high-resolution urban air pollution maps using mobile sensor nodes

Hasenfratz

Saukh

Walser

et al. 2015

Pervasive and Mobile Computing

241

160

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Section: Introductionmentioning

confidence: 99%

Deriving high-resolution urban air pollution maps using mobile sensor nodes

Hasenfratz

Saukh

Walser

et al. 2015

Pervasive and Mobile Computing

241

160

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“…Such large urban agglomerations exhibit intensive human activities and high levels of energy consumption. This leads to very high emissions of a wide variety of air pollutants and greenhouse gases, severely affecting both air quality and climate (Mage et al, 1996;Mayer, 1999;Fenger, 1999;Gurjar et al, 2008;Chan and Yao, 2008;Monks et al, 2009;Gurjar et al, 2010;Baklanov et al, 2010;Parrish et al, 2011;Kanakidou et al, 2011;Cassiani et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Recent satellite-based trends of tropospheric nitrogen dioxide over large urban agglomerations worldwide

Schneider

Lahoz

2015

Atmos. Chem. Phys.

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Abstract. Trends in tropospheric nitrogen dioxide (NO 2 ) columns over 66 large urban agglomerations worldwide have been computed using data from the SCanning Imaging Absorption spectroMeter for Atmospheric CHartographY (SCIAMACHY) instrument onboard the Envisat platform for the period August 2002 to March 2012. A seasonal model including a linear trend was fitted to the satellite-based time series over each site. The results indicate distinct spatial patterns in trends. While agglomerations in Europe, North America, and some locations in East Asia/Oceania show decreasing tropospheric NO 2 levels on the order of −5 % yr −1 , rapidly increasing levels of tropospheric NO 2 are found for agglomerations in large parts of Asia, Africa, and South America. The site with the most rapidly increasing absolute levels of tropospheric NO 2 was found to be Tianjin in China with a trend of 3.04(±0.47) × 10 15 molecules cm −2 yr −1 , whereas the site with the most rapidly increasing relative trend was Kabul in Afghanistan with 14.3(±2.2) % yr −1 . In total, 34 sites exhibited increasing trends of tropospheric NO 2 throughout the study period, 24 of which were found to be statistically significant. A total of 32 sites showed decreasing levels of tropospheric NO 2 during the study period, of which 20 sites did so at statistically significant magnitudes. Overall, going beyond the relatively small set of megacities investigated previously, this study provides the first consistent analysis of recent changes in tropospheric NO 2 levels over most large urban agglomerations worldwide, and indicates that changes in urban NO 2 levels are subject to substantial regional differences as well as influenced by economic and demographic factors.

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“…Pollution from these mega-cities has grave implications on regional to global air quality and climate change (Mage et al, 1996;Molina and Molina, 2004). One of the world's most densely populated mega-cities, the Mexico City Metropolitan Area (MCMA: w19 N, w99 W, w750 hPa), with a population of over 19 million within an area of w1500 km 2 , is among the most polluted cities (IPCC, 2007).…”

Section: Introductionmentioning

confidence: 99%

Satellite observations of Mexico City pollution outflow from the Tropospheric Emissions Spectrometer (TES)

Shim

Luo

et al. 2009

Atmospheric Environment

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a b s t r a c tConcurrent tropospheric O 3 and CO vertical profiles from the Tropospheric Emission Spectrometer (TES) during the MILAGRO/INTEX-B aircraft campaigns over the Mexico City Metropolitan Area (MCMA) and its surrounding regions were used to examine Mexico City pollution outflow on a regional scale. The pollution outflow from the MCMA occurred predominantly at 600-800 hPa as evident in O 3 , CO, and NO x enhancements in the in situ aircraft observations. TES O 3 and CO are sensitive to the MCMA pollution outflow due to their relatively high sensitivities at 600-800 hPa. We examined O 3 , CO, and their correlation at 600-800 hPa from TES retrievals, aircraft measurements, and GEOS-Chem model results. TES captures much of the spatial and day-to-day variability of O 3 seen in the in situ data. TES CO, however, shows much less spatial and day-to-day variability compared with the in situ observations. The DO 3 /DCO slope is significantly higher in the TES data (0.43) than the in situ data (0.28) due partly to the lack of variability in TES CO. Extraordinarily high DO 3 /DCO slope (0.81) from TES observations at 618 hPa over the Eastern U.S. was previously reported

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Urban air pollution in megacities of the world

Cited by 368 publications

References 3 publications

Deriving high-resolution urban air pollution maps using mobile sensor nodes

Deriving high-resolution urban air pollution maps using mobile sensor nodes

Recent satellite-based trends of tropospheric nitrogen dioxide over large urban agglomerations worldwide

Satellite observations of Mexico City pollution outflow from the Tropospheric Emissions Spectrometer (TES)

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