The following HTML text is provided to enhance online
readability. Many aspects of typography translate only awkwardly to HTML.
Please use the page image
as the authoritative form to ensure accuracy.
episodes of high concentrations of ozone. EKMA also simulates ozone formation only along a single trajectory, not providing any regionwide information about the effects of controls.
The number of analyses carried out using grid-based air quality models is limited but growing (see Chapter 10). Urban scale models, such as the urban airshed model (UAM) and the CIT model, have been applied to a number of cities in the United States and elsewhere. The Regional Oxidant Model (ROM) has been applied recently to the northeastern United States and to urban areas in that region.
Ozone isopleth diagram for three cities (A, B, and C) that have the same peak 1-hour
ozone concentrations (Cp). The VOC/NOx ratios differ: a low ratio (c), a high ratio (B),
and a medium ratio (A). Isopleths = lines of constant 1-hour peak ozone.
EKMA is used to generate ozone isopleth diagrams for cities, and EPA