proposal to revise wood stove curtailment values
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Proposal to Revise Wood Stove Curtailment Values
Spokane Regional Clean AgencyPrepared by Ron Edgar
Review of Spokane CountyWood Stove Curtailments Between 2001 & 2007
November 3, 2002
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TPM25
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WS
November 27, 2002
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TPM10
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February 5, 2003
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February 24, 2003
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November 5, 2003
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February 19, 2004
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February 15, 2005
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Start/End
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Review of PM2.5 Data
A look at PM2.5 excursions above 35µg/m3
Table of PM2.5 Events12 Months
Heating Season Jan-Mar & Oct-Dec
>20 >30 >35 >20 >30 >35
1996 20 6 3 15 5 2
1997 28 5 1 23 4 1
1998 16 6 3 13 3 2
1999 9 1 0 8 1 0
2000 25 6 2 18 4 2
2001 18 3 1 14 2 1
2002 13 3 3 12 3 3
2003 17 4 3 11 2 1
2004 18 4 4 13 3 3
2005 17 4 1 15 4 1
2006 15 5 2 10 3 1
Max 28 6 4 23 5 3
Min 9 1 0 8 1 0
Average 18 4 2 14 3 2
Events Above 20µg/m3
Possible Wood Stove Episodes Based on Proposed New Triggers
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1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006
Year
Nu
mb
er o
f E
pis
od
es
>35
>30
>20
Graphs of PM25 Events
10/31/06 - 11/4/06
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Hour
µg
/m3
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Win
d S
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mp
h
PM2.5
PM2.5-24
WS
12/6/05 - 12/12/05
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Hour
µg
/m3
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Win
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PM2.5
PM2.5-24
WS
11/4/04 - 11/8/04
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/m3
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PM2.5
PM2.5-24
WS
10/27/04 - 10/29/04
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Hours
µg
/m3
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PM2.5
PM2.5-24
WS
All the Plots in One
Running 24-hour PM2.5 Overlay
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0 8 16 0 8 16 0 8 16 0 8 16 0 8 16 0 8 16 0 8 16 0 8 16 0 8 16 0 8 16 0 8 16
Hour
µg
/m3
1996 - 1
1996 - 2
1997 - 1
1998 - 1
1998 - 2
2000 - 1
2000 - 2
2002 - 1
2002 - 2
2002 - 3
2003 - 1
2004 - 1
2004 - 2
2004 - 3
2005 - 1
2006 - 1
Analysis of Overlay
Running 24-hour PM2.5 Overlay
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Hour
µg
/m3
Curtailment Program Goals
Protect public health by keeping PM2.5 values below the standard
Call as few curtailments as possible and still protect the public health
Encourage replacement of un-certified stoves by use of 2 levels of curtailment
Conclusions
A two stage curtailment program could work with trigger values of 20 & 30
Not all values above 20 will trigger a curtailment
5 to 9 curtailments a season, 2 to 5 days long
Next Steps
Draft regulation will go out for Public Comment.
Back for Board in September for adoption before the start of the heating season.
Next Two Heating Seasons
Track effectiveness of the curtailments Track ability to forecast and call
curtailmentsMake improvements as necessary.
Determine the feasibility of continuing a two stage curtailment program
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