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Thursday, August 6, 2020 | History

2 edition of Ozone and precursor transport into an urban area found in the catalog.

Ozone and precursor transport into an urban area

Michael W. Chan

Ozone and precursor transport into an urban area

evaluation of measurement approaches

by Michael W. Chan

  • 65 Want to read
  • 35 Currently reading

Published by Office of Air Quality Planning and Standards, National Technical Information Service [distributor in Research Triangle Park, N.C, Springfield, Va .
Written in English

    Subjects:
  • Air -- Pollution -- Pennsylvania -- Philadelphia Region -- Measurement.,
  • Atmospheric ozone -- Pennsylvania -- Philadelphia Region -- Measurement.

  • Edition Notes

    Statementby Michael W. Chan, Douglas W. Allard, and Ivar Tombach ; prepared for U.S. Environmental Protection Agecny, Office of Air, Noise, and Radiation, Office of Air Quality Planning and Standards.
    ContributionsAllard, Douglas W., Tombach, Ivar., United States. Environmental Protection Agency. Office of Air Quality Planning and Standards., AeroVironment Inc.
    The Physical Object
    Paginationxv, 148 p. :
    Number of Pages148
    ID Numbers
    Open LibraryOL17825245M

    Measurements of concentrations of ozone precursors, volatile organic compounds (VOC) and NO{sub x} (NO + NO{sub 2}), are essential to better understand ozone-precursor relationships in urban and regional areas. In the last two decades, major advances on measuring VOC and NO{sub x} have been made.   Precursor and Ozone Removal, Carbon Storage, and VOC Emissions. Based on our modeled forest structure and UFORE-estimated specific pollutant removal rates (), the reforestation project is estimated to remove a total of t O 3 and t NO 2 over our y analysis period and st t aboveground C at year Annual air pollution removal was Cited by:

    Ozone Transport. Surface Monitoring monitoring stations throughout the US record pollution-laden air masses traveling well beyond the local areas where ozone and its photochemical precursor pollutants are initially produced. The slow moving air masses accumulate pollutants all day long as they travel over industrial centers, large fossil. ROMNET is designed to: (1) provide air pollution control agencies in the Northeast with information on ozone and precursor transport between urban areas; (2) assess the impact of regional strategies on ozone concentration and interurban trans- port;1 and (3) provide guidance for incorporating ozone and precursor pollutant transport in future.

    Ozone pollution in urban areas is especially concerning with increasing temperatures, raising heat-related mortality during heat waves. During heat waves in urban areas, ground level ozone pollution can be 20% higher than usual. Ozone pollution in urban areas reaches higher levels of exceedance in the summer and autumn, which may be explained by weather patterns and Chemical formula: O₃. ozone. Tailpipes. Human health, ozone precursor, ecological damage. Local and Regional Ozone (O 2) Major urban air pollutant caused by NOx and VOCs combined in sunlight. NOx and VOC Human health, plants, aesthetics. Regional Sulfur oxides (SOx) Lung irritant and acid rain. Diesel vehicle tailpipes. Human health and ecological damage Local and.


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Ozone and precursor transport into an urban area by Michael W. Chan Download PDF EPUB FB2

Get this from a library. Ozone and precursor transport into an urban area: evaluation of measurement approaches. [Michael W Chan; Douglas W Allard; Ivar Tombach; United States. Environmental Protection Agency.

Office of Air Quality Planning and. Monitoring air pollution upwind of urban areas in order to characterize the ozone and precursor transport into the city is not common, however, and understanding this phenomenon is essential to properly design control strategies to attain and maintain the ozone ambient air quality standard, and to develop models for assessing the impact of interregional transport of ozone and : Michael W.

Chan, Douglas W. Allard. REVIEW OF METHODS FOR MEASURING OZONE AND PRECURSOR TRANSPORT The two primary mechanisms by which ozone and precursors might be transported into an urban area are: Advection of polluted air (ozone and/or precursors) along the surface, and Advection of polluted air aloft, typically at night and during early morning hours above the ground-based inversion.

each urban area when the highest 8-h maximum ozone averages were reported from the monitoring network in the respective urban area. These flights characterize the upwind ozone distribution transported into the urban areas as well as the downwind transport of the ozone plume produced by the urban area.

The goal here is to derive the best possible. In addition, the farther away from the central urban area, the less effect NOx and NMVOC emissions exert on ozone formation.

In the rural areas of Beijing (northern, southeastern, southwestern), the RCs of NMVOC emissions are still positive. However, NOx emissions are positively correlated to ozone, indicating NOx-limitation in ozone by: Based on the analysis of 71 global agglomerations during –, it is found that: 1) not all urban agglomerations have a positive effect on ozone precursor conditions; 2) the negative effects of urban agglomerations can be attributed to the low latitudes and the ecological areas (p area, Author: Jiayi Li, Yuan Gao, Xin Huang.

This book discusses how scientific information can be used to develop more effective regulations to control ozone. Rethinking the Ozone Problem in Urban and Regional Air Pollution discusses: The latest data and analysis on how tropospheric ozone is formed. How well our measurement techniques are functioning.

surface ozone a nd its precursors with re levance to urban air pollution in Nairo bi, Kenya. Journal of Environmental and Agricultural Sciences. 28 - During the Texas Air Quality Study (TexAQS) and Texas Air Quality Study (TexAQS II) field experiments, aircraft measured ozone concentrations Cited by: transport of ground-level ozone and its precursors (volatile organic compounds VOCs, and oxides of nitrogen NO x) exists in North America, particularly where the typical weather patterns flow from upwind regions with high levels of precursor emissions into downwind regions experiencing high levels of Size: 4MB.

ozone and ozone precursors into the area. During these events ozone mixing ratios were similar between BCAA, Horn Rapids and Burbank. For the other 3 events, ozone at BCAA and Burbank was significantly larger (15 to 20 ppbv) than the Horn Rapids site, implying the main area of ozone production is localized to the immediate urban area of the Tri-Cities.

This is File Size: 6MB. Source Apportionment of Ozone Precursor VOCs in Urban Atmospheres by Receptor Modelling give a good insight into the emission sources for ozone precursors.

39 different urban areas. O 3-NO x-VOC sensitivity is a major source of uncertainty in ozone-precursor predictions (See overview of ozone, Figure ) A second purpose is to evaluate the accuracy of chemistry/transport models, which seek to represent the process of ozone formation and transport and often provide the basis for predicting the impact of emissions on O 3.

Over greater distances, ambient ozone concentrations do vary, being sometimes higher in suburban and rural areas than in urban areas (Liu et al. ; Waldman et al.

) and higher away from roads than near roads. Transport of ozone and its precursors can also lead to a gradient in concentrations in an area. During episodes of high rural ozone concentrations, urban areas also experience high ozone peak concentrations, typically in the early afternoon.

A transport and mixing hypothesis is made which interprets these urban ozone peak concentrations as primarily the result of the high background level of ozone and not local photochemical generation.

5 references, 1 figure. Study of ozone chemistry is important at rural sites because ozone precursors may get transported there from the near–by urban or industrial areas.

[4] Several studies have examined the impact of the Asian pollutants on other parts of the world [e.g., Jacob et al.,and references therein].Cited by: Rethinking the Ozone Problem in Urban and Regional Air Pollution discusses: The latest data and analysis on how tropospheric ozone is formed.

How well our measurement techniques are functioning. Deficiencies in efforts to date to control the problem. Approaches to reducing ozone precursor emissions that hold the most : Division on Earth. Wildfires emit O3 precursors but there are large variations in emissions, plume heights, and photochemical processing.

These factors make it challenging to model O3 production from wildfires using Eulerian models. Here we describe a statistical approach to characterize the maximum daily 8-h average O3 (MDA8) for 8 cities in the U.S. for typical, nonfire, by: 8.

Geographic Scale and Transport In many urban areas, ozone nonattainment is not caused by emissions from the local area alone. Due to atmospheric transport, contributions of precursors from the surrounding region can also be important.

Thus, in designing control strategies to reduce ozone concentrations in a local area. Ozone is present in the natural, unpolluted troposphere, and its tropospheric column density is approximately 10% of the total atmospheric (troposphere + stratosphere) ozone column density.

(Logan, ; Brühl and Crutzen, ; Fishman et al., ). in NOx, an ozone precursor, are especially strong. Ozone develops when sunshine and car exhaust fumes come into contact, and is a powerful irritant. This means chil-dren probably avoid playing out-doors on the warmest summer days.

Children, pensioners and those who are ill should not go outdoors when ozone limits are exceeded [See.Nonattainment area boundaries and rural transport areas –45 min ozone precursor emissions (NOx, VOC, CH4, and CO).

o California: Urban areas have large impact from own-state sources, but higher elevation sites, and near-border sites can .This increase in background ozone concentrations in this period is probably caused by a significant increase in ozone precursor emissions in the decades following World War II.

Measurements of the European ozone sonde stations show large increases in free tropospheric ozone from the early s to the s (5–25% per decade during Cited by: 1.