Pollutant transport during a regional o3 episode in the mid-atlantic states

William F. Ryan, Bruce G. Doddridge, Russell R. Dickerson, Raymond M. Morales, Kristen A. Hallock, Paul T. Roberts, Donald L. Blumenthal, Jerry A. Anderson, Kevin L. Civerolo

Research output: Contribution to journalArticlepeer-review

72 Scopus citations


Ozone (O3) concentrations in the Baltimore-Washington (B-W) metropolitan area frequently exceed the National Ambient Air Quality Standard (NAAQS) in the summer months. The most extreme O3 events occur in multi-day high O3 episodes.1 These events can be regional in scale, with O3 concentrations exceeding the NAAQS at numerous locations along the eastern U.S. seaboard, and are typically associated with slow-moving or stagnant high pressure systems.2-5 In the B-W region, the most extreme events typically occur with surface high pressure overhead or just west of the region and an upper air high-pressure area (ridge) to the west or northwest.1 Besides providing conditions conducive to local O3 production (Subsidence and strong low-level inversions, weak horizontal winds, little cloud cover), this weather pattern may also result in transport of O3 and its precursors from heavily industrialized areas west and north of the B-W region. In this paper, observations and back trajectories made during the severe regional O3 event of July 12-15, 1995, are used to confirm the hypothesis that significant regional-scale transport of O3 and its precursors occur during extreme O3 events of the standard type in the B-W area.

Original languageEnglish (US)
Pages (from-to)786-797
Number of pages12
JournalJournal of the Air and Waste Management Association
Issue number9
StatePublished - Sep 1998

All Science Journal Classification (ASJC) codes

  • Management, Monitoring, Policy and Law
  • Waste Management and Disposal
  • Pollution
  • Atmospheric Science
  • Environmental Engineering
  • General Environmental Science
  • Environmental Chemistry


Dive into the research topics of 'Pollutant transport during a regional o3 episode in the mid-atlantic states'. Together they form a unique fingerprint.

Cite this