Clark County Department of Air Quality CDAWG October

Clark County Department of Air Quality CDAWG October, 2014

Staff Changes • New Manager since Nov 2013 – Mike Sword • Reorganization of Planning Division – People Retired – Staff Reassignments Manager Mike Sword Supervisor Robert Tekniepe Computer Modeling Team Lead Zheng Li Vasant Rajagopalan Shiang-Yuh Wu SIP Development Team Lead Rodney Langston Particulate Matter Russ Merle Ozone EIS/Projects/Grants Jean-Paul Huys Al Leskys

Attainment Status 1997 O 3 Maintenance Area 2008 O 3 Attainment/Unclassifiable PM 10 Maintenance CO Maintenance Area Clark County is in Attainment or Unclassifiable for PM 2. 5, SO 2, Pb and NO 2

Regulation Update Several rules had to be updated to avoid EPA sanctions and to approve plans: • Section 12 Rules: – Address I-SIP issues – Rules will be incorporated in the NV SIP • Sections 41, 90, 91, 92, 93 Rules: – Minor changes in order to approve PM 10 Maintenance Plan/Redesignation Request

Las Vegas Ozone Study (LVOS) • Assess influence of stratosphere-to-troposphere transport and long-range transport from Asia on ozone in Clark County • Use of TOPAZ (Tunable Optical Profiler of Aerosols and Ozone) • Campaign from May 19 to June 28 • At least 4 episodes of ozone intrusion – 3 episodes with Asian contribution • In 2014, using same methodology, at least 9 days were identified as stratospheric ozone intrusions • Occur more frequently in S NV than we assumed • Stratospheric Ozone Intrusions are identified in the EER as a natural event.

Ozone Advance Clark County is “on the bubble” Current design value is 77 ppb We want to avoid nonattainment as long as we can On June 12, 2013, DAQ submitted participation request • On June 23, 2014, DAQ submitted the Path Forward letter • No comments from EPA yet on the Path Forward letter • •

Projects in 2015 • Prepare for 2015 Ozone Season Study – Ozone, CO and RH instruments on Angel Peak and Arden Peak – Identify STT -> support exceptional event package – Possibly ozone monitor in Primm • Anticipate new ozone NAAQS – Analyze impacts of new NAAQS

Possible Impacts of New Ozone NAAQS