Search Results

You are looking at 1 - 6 of 6 items for :

  • Data quality control x
  • NOAA/EPA Golden Jubilee x
  • All content x
Clear All
Edith Gégo, P. Steven Porter, Alice Gilliland, and S. Trivikrama Rao

. Data collected in 2003 and 2004 are used to capture the results of the SIP Call implementation. However, because the implementation deadline was delayed and some states were still making the transition to compliance in 2003, the changes we identify may not be whole. Note that other NO x emission control programs, such as the Acid Rain Program, have also been in place since the late 1990s prior to the SIP Call. Therefore, even if, as stated in Environmental Protection Agency (2005) , the effects

Full access
Ho-Chun Huang, Xin-Zhong Liang, Kenneth E. Kunkel, Michael Caughey, and Allen Williams

used to explore the causes and help identify control strategies. Past episodes, no more than a few days in length, typically are chosen for this purpose. Such an assessment approach is valid, assuming meteorological conditions favorable for high pollution levels remain the same. However, to address the potential influence of future climate change, seasonal-to-interannual simulations ( Fast et al. 2002 ; Fast and Heilman 2003 , 2005 ) are needed to assess future changes in air quality ( Bouchet et

Full access
Golam Sarwar and Prakash V. Bhave

for July are presented in Fig. 2a . Ambient monitoring data from the USEPA’s Air Quality System were used for this purpose. Overall, the model results were in reasonable agreement with the observed O 3 concentrations in most areas of the eastern United States. Increases in predicted monthly average daily maximum 1-h O 3 concentrations with chlorine emissions are shown in Fig. 2b . The inclusion of chlorine emissions increased the average daily maximum 1-h O 3 concentrations in the Houston

Full access
George Kallos, Marina Astitha, Petros Katsafados, and Chris Spyrou

, 136 pp . Karyampudi , V. M. , and Coauthors , 1999 : Validation of the Saharan dust plume conceptual model using lidar, Meteosat, and ECMWF data. Bull. Amer. Meteor. Soc. , 80 , 1045 – 1075 . Kassomenos , P. , V. Kotroni , and G. Kallos , 1995 : Analysis of the climatological and air quality observations from the greater Athens area. Atmos. Environ. , 29 , 3671 – 3688 . Katsoulis , B. D. , and D. M. Whelpdale , 1990 : Atmospheric sulfur and nitrogen budgets for southeast

Full access
Steven R. Hanna, Robert Paine, David Heinold, Elizabeth Kintigh, and Dan Baker

1. Introduction The Integrated Urban Air Toxics Study carried out by the U.S. Environmental Protection Agency ( EPA 2000 ) presented a framework for addressing air toxics in urban areas using census tract population centroids for hypothetical receptors. A test example for the Houston, Texas, area was described by EPA (2002) , using a straight-line Gaussian plume model, Industrial Source Complex Short Term, version 3, (ISCST3) ( EPA 1995 ). This work addresses the uncertainties in air quality

Full access
Jesse O. Bash, Patricia Bresnahan, and David R. Miller

1. Introduction Current air quality modeling approaches to deposition and natural surface emissions oversimplify the physical, biological, and chemical processes present at the air–surface interface. The separate treatment of deposition and emissions and the omission of pollutant storage in the surface media compromise the current approach to modeling the surface interface ( Wesely and Hicks 2000 ). Resistance models of deposition velocity must be parameterized in a more fundamental physical

Full access