last updated 15 January 2001
This page describes my little niche in the study of air quality network design. I am focussed
on particulate matter networks at the moment. I am attacking this research problem using
primarily physical approaches, using my background in atmospheric physics. Most of this
research has been done during the planning stage for the California Regional PM10/PM2.5 Air
Quality Study (CRPAQS). A recent application of network design is being used to site a
new PM10 monitor in New Mexico Environment Department's PM10 network. I hope to post some
of the useful network design tools that I have developed in the coming months.
Why monitor for particulate matter or any pollutant? Go here for a primer on clean air standards by the U.S. EPA
What is particulate matter? See this Particulate Matter FAQ for some quick answers.
Click here to go to the U.S. EPA web site to get the final revisions to the ozone and PM2.5 National Ambient Air Quality Standards (NAAQS).
Does your air exceed the national air quality standards? Go here to see the list of U.S. non-attainment areas
Links to many air quality sites
If you are interested in the latest in air quality research go to
this page to find current research in air quality. This page has
various links to reports, on-line data and technical findings related primarily to particulate
Current activities relating to particulate matter network design are:
One of the goals of my research is to establish objective particulate matter network design principles and to apply them to a research level monitoring network in central California.
This is accomplished by:
- 1. Defining and quantifying particle and atmospheric properties that affect their ambient mass loading and human exposure;
- 2. Identifying and comparing performance measures that quantify the information content of particle measurement networks for different monitoring purposes;
- 3. Articulating an objective procedure for designing and evaluating particulate monitoring networks for different levels of information availability; and
- 4. Applying these performance measures to data from existing networks and evaluating their utility.
- 5. Analysis of PM10, PM2.5 and other particulte matter measurements in central California
California Regional PM10/PM2.5 Air Quality Study (CRPAQS)
This link takes you to the Field program plan for the CRPAQS at Air Resources Board
The California Regional PM10/PM2.5 Air Quality Study (CRPAQS) intends to improve
scientific understanding of excessive PM levels in central California. Specifically,
this understanding is needed to determine where and when populations experience
excessive exposures, as defined by NAAQS and state air quality standards, and how to
cost-effectively reduce those exposures to acceptable levels. CRPAQS is an integrated
effort that includes air quality and meteorological field measurements, emissions
characterization, data analysis and air quality modeling. CRPAQS activities are
complementary to long-term monitoring and research activities being conducted by the
California Air Resources Board, the U.S. Environmental Protection Agency, the
SJVUAPCD, the BAAQMD, the GBAPCD, and other air quality districts in the region.
>Click here to view the air basins and elevations in the CRPAQS study region
The field planning document specifies measurements to be taken in central California between
December 1999 and January 2001 to meet the objectives of the CRPAQS through data
analysis and numerical simulations. It describes the study area, its emissions
and meteorology, and hypotheses about the causes of high particle concentrations.
It identifies measurement locations, observables, and monitoring methods. It
specifies data management and reporting conventions and outlines the activities
needed to ensure data quality.
The CRPAQS field study consists of a long-term campaign from 12/1/1999 through
1/31/2001, a winter intensive study within the period of 11/15/2000 through 1/31/2001,
and a fall intensive study within the period of 9/1/2000 through 10/31/2000. Several
experiments will be conducted during the summer period of 7/1/98 through 8/31/98.
Details on these measurements are presented in Sections 4 through 7 of this plan.
Analysis to determine potential transport sites for annual field study in central California.
The suggested sites are evaluated considering wind patterns from ARB, RAWS, CIMIS and NWS
meteorological stations, historical air quality, land use land cover, terrain, elevation,
exposure and accessibility.
Analysis of data from high temporal resolution or continuous
particulate monitors. Questions to answer are: What meaningful information can be extracted
from < 1-hr averaged measurements? How is information extracted from time series data?
What do these measurements tell about the nearby sources and meteorology? What do these
results imply for network design? What are the physical and technological limitations in short
duration aerosol measurements using commercial instruments? Some of the cases and associated
data considered are shown below.
- 1. Altamont Pass
- 2. Pacheco Pass
- 3. Northern Carrizo Plain
- 4. Southern Carrizo Plain
- 5. Walker Pass
- 6. Tehachapi Pass
- 7. Tejon Pass
- 8. Cajon Pass (summer transport)
September 3 to 9, 1998, 1-minute averaged particulate mass from a TSI DustTrak monitor with PM10 inlet.
- 1. Plot showing magnitude of peaks
- 2. Plot showing detailed temporal variations
December 2, 1998 to February 17, 1999 5-minute average light scattering at five Sierra sites.
- 1. Map showing locations of the five sites
- 2. Temporal analysis of the mixed layer over the San Joaquin Valley and Sierra foothills
- 3. Spectral analysis (DFT, SSA, wavelet, correlation analysis)
June 1996 paved and unpaved road side dust study in the SJV.
- 1. Spectral analysis of 10 Hz sonic anemometer measurements
- 2. Side by side comparison of collocated nephelometers
- 3. Turbulent kinetic energy generation from vehicle wakes
Long term study of hourly PM10 TEOM, BAM and COH measurements in the San Joaquin Valley
- 1. Diurnal, weekly, monthly and seasonal patterns
Hourly PM measurements taken during IMS-95 Winter study in the SJV.
- 1. Bakersfield PM2.5 TEOM
- 2. Nephelometers for characterizing light scattering
- 3. Aethalometers for characterizing light absorption
Light scattering measurements at a residential area in Sparks, NV.
- 1. Collocated precision of two DUSTTRAK nephelometers
- 2. Comparison of filter and light scattering measurements
Researching theoretical and practical particulate matter network design strategies (Dec 18, 1997 presentation);
Environmental monitoring network references last updated on 30 January 2001;
Incorporating various environmental and air quality network data in a GIS and looking for sources of free GIS data on the internet;
Visualization is currently being done with ARC/INFO and ArcView.
GIS bibliography last updated 12 March 2000
Geostatistics bibliography last updated on 15 March 2000
- Go back to Dave's research page