Transcript AIR POLLUTION PPT.pptx

The Impact of Delaying Ground
Level Ozone NAAQS in 2010
Current Standard v. Proposed Standard
• Current standard is the 8 hour GLO (ground
level ozone) be below .075ppm
– Average over 8 hours
– 4th highest such number average with the similar
number from prior 2 years
• Proposed Standard had two prongs –
– Reduce the .075 ppm to .065 (approx).
– Introduce a 1 hr standard aimed at peak levels of
ozone.
Impact of NOT Tightening
• Main Conclusions:
– About half of jurisdictions are out of compliance
with current .075 standard ->tightening would
merely have made them further out of compliance
– Monitoring GLO itself may not even be an
effective approach to GLO reduction
– Even in the absence of stricter standards progress
can and should be made
Current Standard Already Challenging
Jurisdictions
• More than half of jurisdictions don’t meet current standard
• Long term trend is down
Directly Tracking GLO – May Not be
the Way to Go
• GLO is the result of Nox and VOCS.
– Need both precursors to be controlled
– Either may be dominant
– GLO may “happen” far from precursor emissions
• Other tool in the tool box –
– Separate precursors in place and time!
– E.g. target VOCs for night production
– Separate emitters
Example$
of$targeted$strategy$
opportunity$
Targeted
ReductionIllustrative
Case
Connecticut Fossil Fuel Fired Electric Generating Units
Peak Day Analysis
120,000
A lot of NOx
A little Power
Demand Response
(Emergency Diesel Engines)
NOx Emissions (pounds)
or Generation (MW Hours)
100,000
Oil Fired Peaking
Combustion Turbines
80,000
Residual Oil Boilers
60,000
Natural Gas Units
40,000
Coal Boilers
20,000
0
Fossil Generation
NOx Emission
'
Peak NOx emission on hottest days – worst possible case for
aphic'illustrates'that'when'demand'is'at'or'near'peak'–'inefficient'diesel'electrical'generation'used
GLO production
on'line'to'meet'that'peak.'Usually'when'that'demand'is'at'a'peak'–'the'weather'is'hot'–'and'the'sun
strong'–'so'it'become'an'ideal'environment'for'the'production'of'Ozone!'
Taking action to reduce these (based on other NAAQS will
n'the'discussion'we'noted'that'while'the'overall'levels'of'Ozone'was'out'of'compliance'with'the'
lower GLO in CT)
rd'–'the'level'had'been'falling.'No'doubt'the'numerous'SIPs'in'place'have'contributed'to'that'obser