PERCH Air Quality Study An Assessment of Particulate Matter, Ozone, and Air Toxics in Escambia and Santa Rosa Counties. PERCH Air Quality Study Team. Principal Investigator: Dr. Michael E. Chang Co-Principal Investigators: Dr. Karsten Baumann Professor Ann Bostrom
An Assessment of Particulate Matter, Ozone, and Air Toxics in Escambia and Santa Rosa Counties
Dr. Michael E. Chang
Dr. Karsten Baumann Professor Ann Bostrom
Professor Armistead Russell
Dr. Carlos Cardelino Mr. Ryan Gesser
Dr. Yongtao Hu Ms. Laura King
Dr. Talat Odman Dr. Richard Peltier
Ms. Azin Sahabi Dr. Rama Mohana R Turaga
Professor Rodney Weber Mr. Wes Younger
Does a connection exist between air pollution / air toxics and adverse human health outcomes in the Pensacola area?
August 26, 2001
In 2001 – 2002 interests and concerns were varied among the study’s stakeholders:
Ground-level Ozone: Chief concern of Local Community, Business, and Industry
“…[the American Lung Association] ranked Escambia as having the worst ground-level ozone problem in Florida.”
Fine Particulate Matter: Primary intellectual interest of investigators
“The Pensacola area has the highest recorded concentrations of fine particle pollution in Florida.”
“…Escambia County ranks among the nation’s leaders in toxic air pollution.”
Air Toxics: Leading interest of sponsors
At concentrations observed contemporarily (1996-2002) in Pensacola:
Key Findings: particulate matter likely presents the greatest risk to human health generally related to air quality in the Pensacola region.
Implications: Of the three classes of pollutants, ozone is the most well understood pollutant, though it may not pose the greatest health risk. Less is known about particle pollution and air toxics. In terms of allocating PAQS resources, the investigation’s ensuing primary focus (i.e. in Phases II and III) will be on PM, secondary on air toxics, and tertiary on ozone.
All of FL meeting 1997 National Ambient Air Quality Standard for O3
But several areas may not meet 2008 NAAQS
All of FL meeting 1997 and 2006 National Ambient Air Quality Standards for PM2.5
Designations for 2006 PM2.5 NAAQS
Mobile Air Quality Laboratory at the OJ Semmes Elementary School, July 15 – August 14, 2003
Trends of the major air pollutants measured at OJS and other sites between July 15 and August 15, 2003
Fine particulate matter composition measured at OJS between July 18 and August 12, 2003
Mass (top) and fractional (bottom) VOC contributions from each source at the OJS site.
Total Mass (ppbv)
Relative Composition (%)
Key findings:sulfate was a large fraction of the observed ambient PM2.5 loading; organic carbon was likewise found also to be a large fraction of the ambient PM2.5loading; gasoline related sources are the dominate contributors to ambient gaseous VOC concentrations (suggesting also that they are the primary contributors to organic PM).
Implications: coal and gasoline combustion were observed to account for most of the Pensacola atmosphere’s particle load during a high pollution event. Additional analyses (see Phase III) are needed to discern between local and regional sources, however.
FAQS Model Reanalysis
July 5-18, 2001
Model tells same general story as measurements: sulfate, ammonium, and organics most prevalent
From where do they come?Modeled PM2.5 Components
Emissions from FL, AL, GA, TN, NC, and SC ammonium, and organics
VOC Emissions (tons per day)
Key findings:sulfate constitutes half or more of the particulate load, however, sulfate is most sensitive to distant sources.
Key findings:ammonium is a significant part of the particulate load, and it is most sensitive to local sources.
RAIMI Modeling for Air Toxics – Cancer risks from Point Sources
Phase III: Painting the big picture – part 2a ammonium, and organics
Key Findings: Three areas in Santa Rosa County and one area in Escambia County were estimated to have a possible elevated risk of cancer due to emissions from point sources. Only the Pace community in Santa Rosa County had a significant residential presence in close proximity to the industrial source. The estimated risks are of a magnitude that is consistent with risks found near other industrial sources.
Implications: With some exception for residential areas very near or within the industrial zones, emissions from point sources are not a widespread source of cancer risk via the inhalation pathway in the Pensacola area.
RAIMI Modeling for Air Toxics – Cancer risks from Mobile Sources
Phase III: Painting the big picture – part 2b ammonium, and organics
Key Findings:elevated cancer and non-cancer risks due to mobile sources are ubiquitous in the Pensacola area with higher risks generally along more highly traveled roadways. Risk diminishes by several orders of magnitude a few hundred meters off the roadway.
Implications: residential and other populated areas immediately adjacent to busy roadways may incur significantly elevated cancer and non-cancer risks.