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2005 Residential Wood Combustion Emissions Estimates. based on WSU 2001 Survey. July 19, 2007. Purpose of Survey: Update residential wood combustion emissions estimates. Last statewide survey was done by Bonneville Power Administration in 1990

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2005 residential wood combustion emissions estimates

2005 Residential Wood Combustion Emissions Estimates

based on WSU 2001 Survey

July 19, 2007


Purpose of survey update residential wood combustion emissions estimates
Purpose of Survey: Update residential wood combustion emissions estimates

  • Last statewide survey was done by Bonneville Power Administration in 1990

  • Post-1990 woodstove sales indicated downward trend

  • 1990 – 2000 population growth ~ 21%

  • Current information wanted for air stagnation advisories, and air quality planning


Survey partnership
Survey Partnership emissions estimates

  • Washington, Oregon, Idaho, and Canada were working together to develop regional emissions estimates for air quality analyses

  • Federal Environmental Protection Agency special project funding was available to states

  • WA/OR/ID combined EPA funding to make improvements to several emissions sources, including residential wood combustion


Survey
Survey emissions estimates

  • Social & Economic Sciences Research Center, Washington State University

    • John Tarni, Ph.D., principal investigator

    • Thom Allen, study director

  • Computer-assisted telephone interviews

  • Trained interviewers

  • Six call attempts, and individual scheduling

  • Interviewer monitoring

  • All responses were recorded. Database of coded responses was provided.


Survey sampling
Survey Sampling emissions estimates

* Purge removed all known non-working and non-household phone lines

** Incomplete included: refusals, unable to reach, non-working numbers,

business numbers, unable to interview, FAX numbers, partial interviews


Survey design
Survey Design emissions estimates

  • Questions designed to estimate

    • number of households owning and using wood-burning devices

    • amount of wood burned by device and certification status

    • geographic differences

    • seasonal, weekday/weekend, hourly variation

  • Drew upon 1990 BPA survey questions

  • Funding determined number of questions, sampling areas, and sample size


Questions devices owned by type
Questions – Devices Owned by Type emissions estimates

  • Do you have a …

    • fireplace without a stove insert?

    • fireplace with a stove insert?

    • free-standing woodstove?

    • pellet stove?

    • wood-fired central furnace?

  • Do you know when your stove or insert was purchased? (determines certification status)

    • year (month if known), or

    • approximately how old

  • If more than one device, which is used most for heating?




Questions devices used by type
Questions - Devices Used by Type emissions estimates

  • Did you burn any cord wood last year?

  • Did you burn any presto logs last year?

  • Did you burn any wood pellets last year?




Questions amount of wood burned
Questions – Amount of Wood Burned emissions estimates

  • How many cords did you burn last year?

    • cord is 4’ x 4’ x 8’

  • How many presto logs did you burn last year?

  • How many 40-lb bags of wood pellets did you burn last year?


Supporting data conversion to pounds burned
Supporting Data – Conversion to emissions estimates pounds burned


Results wood burned in tons
Results – Wood Burned in Tons emissions estimates


Results wood burned in tons1
Results – Wood Burned in Tons emissions estimates


Supporting data pm 2 5 emission rates in pounds per ton burned
Supporting Data – PM emissions estimates2.5 Emission Rates in pounds per ton burned

Certified INS and WS assumes split of 71% non-catalytic and 29% catalytic per the 2002 National Emissions Inventory (EPA).


Results pm 2 5 emissions estimates in tons per year
Results – PM emissions estimates2.5 Emissions Estimates in tons per year


Results pm 2 5 emissions estimates in tons per year1
Results – PM emissions estimates2.5 Emissions Estimates in tons per year


Survey summary statistics
Survey Summary Statistics emissions estimates


Questions temporal variation
Questions – Temporal Variation emissions estimates

  • Did you use this equipment in the …

    • winter, spring, summer, fall of 2000? (months were specified for each season)

  • During a typical weekday, did you use this equipment from …

    • 6am-10am, 10am-4pm, 4pm-10pm, 10pm-6am?

  • During a typical weekend, did you use this equipment from …

    • 6am-10am, 10am-4pm, 4pm-10pm, 10pm-6am?


Results temporal variation
Results – Temporal Variation emissions estimates


Results temporal variation1
Results – Temporal Variation emissions estimates


Questions and results heating sources
Questions and Results – Heating Sources emissions estimates

  • What is your main source of heat?


Home heating statistics sources
Home Heating Statistics Sources emissions estimates

  • AHS04: 2004 America Housing Survey, Seattle-Everett Metro Area (http://www.census.gov/prod/2005pubs/h170-04-60.pdf)

  • CEN00: 2000 Census (http://www.census.gov/Press-Release/www/2002/demoprofiles.html)

  • WSU01: 2001 WSU Wood burning survey


Observations on estimates

Strengths emissions estimates

activity based on local survey

survey reduction process was checked by ODEQ

number of devices similar to surveys done for PSCAA

incorporated/unincorporated and east/west differences

emissions factors were considered above average by EPA

air quality modeling results not unreasonable (explain)

Weaknesses

survey generally did not ask questions in multiple ways (verification)

required many steps to calculate emissions estimates from survey responses

may somewhat overestimate cord wood use

emission factors are based on testing done in late 1980s to 1990

inherent variability

Observations on Estimates


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