About the Web Tool

The DEASCO3 web tool provides users the ability to review well-chosen Case Studies and create custom fire analyses. Case Studies are a series of fire events chosen for their relevance to demonstrating fire ozone contributions. A total of nineteen (19) Case Studies were developed for this project. User analyses can be created using the same data and tools that helped construct each DEASCO3 Case Study. Both Case Studies and user analyses can be attached to relevant air quality support types. This gives users the ability to learn about support types, fire events, and explore data related to Case Studies and custom analyses.

Case Studies

DEASCO3 Case Studies were chosen for their relevance to demonstrating ozone contribution and support type for known fire events. Case Studies were developed to characterize the relationship of emissions from fire to ozone concentrations across a broad range of circumstances (e.g., geographic locations, fuel conditions, time of year, fire types, and contributions to elevated background levels and levels in excess of the proposed Ozone NAAQS). Each study’s ozone contribution is illustrated through observed and/or modeled data. Fire statistics and background information are provided to outline the event. Case Studies can be researched by corresponding support type or the event’s location and name.

Most-Impacted Areas

Metrics were used to determine a rank-ordered list of counties most affected by ozone formation due to planned fires. Each metric provided a single numerical value, by county, by interrogating observed ozone, CAMx modeling, and fire activity data in various ways. Weights were assigned based on best professional judgement of the importance of the metric to the final rank order list. For example, more weight was given to metrics that directly looked at the casual relationship between fire and ozone formation.

Most-impacted areas by county.

Analysis Support Types

Analyzing the relationship of emissions from fire to ozone concentrations is supported using three designated pathways: Exceptional Events, Fire Planning and State Implementation Plan (SIP) Support. Each pathway provides a brief overview of the anlaysis type and links to related Case Studies. Reviewing a related Case Study will show a more detailed analysis of data related to that analysis type.

Starting an Exceptional Events analysis from the registered user landing page.


DEASCO3 provides a series of data plotting and summarization tools designed to help understand a fire’s contribution to ambient ozone. The tools allow comparison of actual observed ozone, model results and current and proposed ozone NAAQS. Additional tools allow summarization of analysis location and general information. Some key tools are:

  • Ozone and Fire Activity Map. Plots fire activity and ozone stations within the analysis boundary.
  • Summary Fire Statistics. Outlines key statistics from fire activity within the analysis boundary.
  • Ozone Time Series. Plots observed ozone versus modeled ozone for a selected monitoring station.

When creating an analysis, the toolbar is used to access plots, maps and other tools.