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A Data Management System (DMS) for Air Quality Management Agencies
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A Data Management System (DMS) for Air Quality Management Agencies. Prepared by: Mark Stoelting Bay Area Air Quality Management District San Francisco, CA and Eric Gray Sonoma Technology, Inc. Petaluma, CA Presented at: U.S. EPA 2008 National Air Quality Conference Portland, OR

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A Data Management System (DMS) for Air Quality Management Agencies

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A Data Management System (DMS) for Air Quality Management Agencies

  • Prepared by:

  • Mark Stoelting

  • Bay Area Air Quality Management District

  • San Francisco, CA

  • and

  • Eric Gray

  • Sonoma Technology, Inc.

  • Petaluma, CA

  • Presented at:

  • U.S. EPA 2008 National Air Quality Conference

  • Portland, OR

  • April 6-9, 2008

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DMS: Why, What, How, Who

  • Why build a DMS?

  • What is it?

  • How does DMS work?

  • What are the DMS capabilities?

  • Who is involved?

  • Who paid for DMS?

  • Where is it going?

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Why the DMS?

  • New technology: instruments, communications, data access

  • Real-time data access

  • Improve data quality (QC checks)

  • Graphical data reviewing tools

  • Minimize/eliminate need for paper

  • Track instruments and performance

  • Shared need by all monitoring agencies

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What is DMS?

  • Data Management System

    • Database to ingest, process, export data

    • Archive

  • Programmable database with optional features

    • Process sub-hourly data (1 minute)

    • Collect instrument metadata

    • Track instruments and performance (OpCodes)

    • Automatic Quality Checks

    • Export (AirNow, AQS)

    • Notification (email, process controls)

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Simple Data Structure


  • Site,Parameter,Date_Time,OpCode,Data,[alpha_data]

  • 7011,CO_chamt,10/05/2007 08:16,0,48.1580,

(optional, assigned in database)






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Sites, Parameters, Instruments

Establish Monitoring


Create Parameters



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Assign Parameters to Instruments and Instruments to Sites

Assign Parameters

to Instruments

Assign Instruments

to Sites

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Automated Quality Checks/Export


Air Quality









Site checks

Network (off-site)



Web Page

Exports filtered by QC code

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Automatic Quality Checks

Assign Automatic

Quality Control

Checks to


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Data Input Process

  • Ingests data files generated by datalogger or data formatting software

  • Duplicate input data is automatically rejected

  • Automated Quality Checks establish initial QC code

    • Min/max, zero drift, sticking, rate-of-change, compare

  • QC conditions can activate process/alarm

  • Electronic chain-of-custody created

  • Sub-hourly data aggregated to 1-hr averages

  • Automated data export to AIRNow and Air District web site

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DMS Status

Station Reporting Status

Event Log

QC Log

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Manual Data Review

  • Time-series graphical editing and QC tools for staff data review

  • DMS records all reviews and manual adjustments to QC status and data values (electronic chain-of-custody)

  • Tracks manual data reviewer status

  • Lock final data prior to export

  • Exports final data for regulatory submission to AQS or other agencies

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Time Series Edit/QC Screen

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Scatter Plot Analysis

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Other DMS Features

  • Data access security (user rights management)

  • Maintains instrument equipment database

  • Supports electronic instrument and site logs

  • Daily instrument performance reports (using OpCodes)

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DMS Software Requirements

  • DMS host computer:

    • Windows Server 2000/2003 or XP/Vista

    • Microsoft SQL Server 2005 (all editions)

  • DMS Client Software:

    • .NET 2.0 Framework

    • Windows 2000, XP, Vista

  • Future tools may require Java and ERSI arcGIS

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DMS Hardware

  • DMS Server:

  • Minimum server requirements – Pentium 4 laptop

  • Must support Microsoft Windows

  • Hardware determined by processing needs

  • Laptop processes hundreds of thousands of records per hour and store millions

  • Server can process millions of records per hour and store billions

  • DMS Client:

  • Pentium III class PC or better

  • Broadband connection to DMS Server

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DMS Performance Benchmarks

  • AIRNow DMC DMS will be running in August on a Quad Core Intel processor with 8 GB of RAM. The operating system will be Windows Server 2003 64-bit Edition

  • •Currently, AIRNow DMC processes 12 million records a day for over 5000 sites

  • •The DMS system can process 22 million records per hour or ½ billion a day (historical data import)

  • •The Bay Area DMS system will process 1 million data records per day

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DMS Storage Benchmarks

  • The database will grow by 100 MB for every one million records

  • One billion records can be stored in 100 GB data

  • DMS query performance has been tested with ½ billion data records

  • AIRNow DMC will test performance for over a billion records by fall

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DMS Can Be …

  • An instrument monitoring system

  • A data analysis system

  • A data Quality Check and Review system

  • A data export tool (to AirNow, AQS)

  • A data warehouse for historical data

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Agency Deployment

  • DMS developed using AIRNow technology in 2004

  • DMS to replace AIRNow technology by fall 2008

  • DMS in use by BAAQMD, SCAQMD, and CARB by end of 2008

  • AIRNow International will be based on DMS for 2009

  • Stable DMS distribution package available for agency use by early 2009

  • Looking for 3 or 4 additional agency development partners in 2008

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Development and Funding

  • DMS was development and funded by agencies with an interest in the result

  • Contributors include:

    • Bay Area AQMD (BAAQMD)

    • EPA Region IX, 103 Grant

    • EPA National Environmental Information Exchange Network (NEIEN) Challenge Grant

    • South Coast AQMD (SCAQMD)

    • EPA (AirNow and AirNow International)

    • California Air Resources Board (CARB) soon

  • New DMS features must be available to all agencies

  • New features must not reduce DMS functionality to other agencies

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Future DMS Development

  • Enhanced view/edit features

    • Viewing tools - fingerprint plots

    • Statistical tools - box plots, reports

  • Support for toxics, PM filter data, Special Purpose Monitoring

  • Expanded reporting capabilities

  • Instrument Control Charts

  • GIS mapping capability, web services, and NEIEN XML data exchange node

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DMS Summary

  • Simple, scalable, cost-effective

  • Fast, secure, and efficient operation

  • Comprehensive quality control tools

  • Applicable to a wide variety of data

  • Free to public agencies under a share-ware use agreement

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Contact Information

  • Mark Stoelting

  • Bay Area Air Quality Management District

  • mstoelting@baaqmd.gov

  • (415) 749-4619

  • Eric Gray

  • Sonoma Technology, Inc.

  • eric@sonomatech.com

  • (707) 665-9900

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