Ozone pollution in the urban atmosphere of Delhi

Varshney, C. K.; Aggarwal, Maneesha

doi:10.1016/0957-1272(92)90004-c

Cited by 64 publications

(27 citation statements)

References 7 publications

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“…During 1997, O 3 levels were 150 -200 g/m 3 for 1-hr and 100 -200 g/m 3 for 8-hr averages. 206 Varshney and Aggarwal 198 and Singh et al 199 observed 1-hr average O 3 concentrations exceeding the prescribed WHO standard of 100 g/m 3 at various locations in Delhi. Compared with other large Indian cities such as Mumbai, Chennai, and Kolkata, the accumulation of air pollutants in Delhi during winter is more critical.…”

Section: Greater Toronto Area and Central Ontariomentioning

confidence: 99%

Megacities and Atmospheric Pollution

Molina

2004

Journal of the Air & Waste Management Association

692

372

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About half of the world's population now lives in urban areas because of the opportunity for a better quality of life. Many of these urban centers are expanding rapidly, leading to the growth of megacities, which are defined as metropolitan areas with populations exceeding 10 million inhabitants. These concentrations of people and activity are exerting increasing stress on the natural environment, with impacts at urban, regional and global levels. In recent decades, air pollution has become one of the most important problems of megacities. Initially, the main air pollutants of concern were sulfur compounds, which were generated mostly by burning coal. Today, photochemical smog-induced primarily from traffic, but also from industrial activities, power generation, and solvents-has become the main source of concern for air quality, while sulfur is still a major problem in many cities of the developing world. Air pollution has serious impacts on public health, causes urban and regional haze, and has the potential to contribute significantly to climate change. Yet, with appropriate planning, megacities can efficiently address their air quality problems through measures such as application of new emission control technologies and development of mass transit systems.This review is focused on nine urban centers, chosen as case studies to assess air quality from distinct perspectives: from cities in the industrialized nations to cities in the developing world. While each city-its problems, resources, and outlook-is unique, the need for a holistic approach to the complex environmental problems is the same. There is no single strategy in reducing air pollution in megacities; a mix of policy measures will be needed to improve air quality. Experience shows that strong political will coupled with public dialog is essential to effectively implement the regulations required to address air quality problems.

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Section: Greater Toronto Area and Central Ontariomentioning

confidence: 99%

Megacities and Atmospheric Pollution

Molina

2004

Journal of the Air & Waste Management Association

692

372

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“…A number of previous O 3 studies conducted both in Kuwait and around the world confirmed the existence of the second (afternoon) peak (Bouhamra & Abdul Wahab, 1999;Abdul-Wahab & Bouhamra, 2004;Varshney & Aggarwal, 1992;Lorenzini, Nali, & Panicucci, 1992); in addition, recent studies reported the observation of the first (nocturnal) O 3 peak (Bouhamra & Abdul Wahab, 1999;Abdul-Wahab & Bouhamra, 2004;Eliasson, Thorsson, & Andersson-Skold, 2003;Alp & Asude-Ozkan, 2009). These studies attributed the origin of the O 3 afternoon peak to the photochemical reactions.…”

Section: Diurnal Variationsmentioning

confidence: 88%

“…High levels of O 3 were detected during the summer season (July 0.072 ppm and August 0.069 ppm), while lower levels were distributed over the winter season (December 0.027 ppm and January 0.029 ppm). Numerous studies conducted around the world reported high O 3 levels during the summer season (Bouhamra & Abdul Wahab, 1999;Abdul-Wahab & Bouhamra, 2004;Varshney & Aggarwal, 1992;Lorenzini, Nali, & Panicucci, 1992)). This common behavior of O 3 was justified by the dominant photochemical production process of O 3 due to the presence of NO x , NMHC, and intense solar insolation (observed summer temperatures- Figure 3a) during the summer times.…”

Section: Diurnal Variationsmentioning

confidence: 99%

Characterization of Road Traffic Emissions in a Densely Populated Residential Area of Kuwait

Jallad¹,

Espada-Jallad²

2012

ENRR

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Analysis of road traffic emissions in the Salmiyah residential area of Kuwait was conducted over a period of 12 months, from March 2008 to February 2009. Salmiyah is a densely populated area, mainly by expatriates. Apartment buildings are the dominant type of dwellings available in Salmiyah. Major highways surround this residential area where heavy traffic congestion occurs during rush hours. The objectives of this work were: to monitor ambient tropospheric levels of carbon monoxide (CO), nitrogen dioxide (NO 2 ), sulfur dioxide (SO 2 ), non-methane hydrocarbons (NMHC), and ozone (O 3 ), to understand their diurnal behaviors, and to study their seasonal trends. The results of this study indicated that (i) CO, NO 2 , SO 2 , NMHC and O 3 exceeded the ambient air quality standards during specific times of the year; (ii) the diurnal patterns for CO, SO 2 , NO 2 , and NMHC showed three peaks which were directly dependent on high traffic density, while only two daily maxima were observed in the case of O 3 ; (iii) O 3 compared to the other gaseous pollutants exhibited a completely opposite monthly mean distribution since the highest concentration levels were detected during the summer season (July and August).

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“…Many studies of O 3 pollution in the lower atmosphere have been engaged in several countries. [1][2][3][4][5][6][7][8] In those works, the authors found that O 3 concentrations were greatly influenced by the local meteorological conditions. In China, photochemical episodes are rare because vehicle numbers per household in major cities are much less than those in the United States and other western countries.…”

Section: Ozone (O 3 )mentioning

confidence: 99%

Case Studies on the Processes of Surface Ozone Pollution in Shanghai

Zhu

1999

Journal of the Air & Waste Management Association

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Typical processes of ozone (O 3 ) pollution in the lower atmosphere in Shanghai are studied in the winter, summer, and autumn of 1994. Relationships between O 3 -NO x (nitrogen oxide) concentrations and meteorological parameters are analyzed in order to find meteorological indices corresponding to high O 3 concentration days. Meteorological conditions favorable for high O 3 concentrations usually appear when Shanghai is dominated by a highpressure system in the lower atmosphere, while a northwestern current prevails over this area in the upper atmosphere. High O 3 concentrations can occur when the wind speed is relatively high. O 3 could increase rapidly on fog days. Temperatures influencing O 3 concentrations are not as obvious in summer as in winter. Some possible mechanisms for the measurement results are suggested in this paper.

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Ozone pollution in the urban atmosphere of Delhi

Cited by 64 publications

References 7 publications

Megacities and Atmospheric Pollution

Megacities and Atmospheric Pollution

Characterization of Road Traffic Emissions in a Densely Populated Residential Area of Kuwait

Case Studies on the Processes of Surface Ozone Pollution in Shanghai

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