the city of houston’s mobile ambient air monitoring lab ：休斯敦移动的空气环境监测实验室的城市

1,The City of Houstons Mobile Ambient Air Monitoring Lab:A Look Back and the View Ahead,Mobile Laboratory Program Team:James Rhubottom, Jr., Dr. Youjun Qin, Dr. Peter ChenProgram Manager: Dr. Wei-Yeong Wang2010 NAQC - 16Mar10,2,Who really needs a Mobile Ambient Air Monitoring Laboratory?,3,Initial MAAML Monitoring Locations,Three-plant industrial complex where BAQC initially deployed the MAAML,4,Forward and back trajectory for 01Oct07 1,3-butadiene release,Forward and Back Trajectories (Original Software),5,A styrene emission back trajectory showing the benefits of the new software,Back Trajectory (Upgraded Software),6,MAAML deployment and PID monitoring sites at a local storage drum plant,Case Study A Incorporating Multiple Analyses,7,Table #2: GC/MS data (ppbv) - MAAML monitoring run (one hour sampling),Case Study A Incorporating Multiple Analyses,Table 1: VOC Readings (PID) - Facilitys west fence line (one minute averages),8,Case Study A Incorporating Multiple Analyses,Back trajectories and resultant wind directions from a MAAML monitoring run at a local storage drum plant,9,PM concentration vs. time - MAAML monitoring run (02Sep09),Case Study A Incorporating Multiple Analyses,10,Wind speed and direction vs. time - MAAML monitoring run (02Sep09)Note: Readings taken as five minute averages,Case Study A Incorporating Multiple Analyses,11,Case Study A Incorporating Multiple Analyses,Recent IR camera and standard video indicating ongoing VOC releases (03Mar10),12,Based upon the combination of collected MAAML data, IR camera footage, and ongoing plant investigations performed by field investigators from BAQCs Complaints and Community Assistance Section (CCA), the facility voluntarily agreed to make changes as noted below.Equipment modifications, namely removal of rain caps from all process stacksEquipment replacement along with height increases for four vent stacks that emit VOCs (typically paint solvents) directly to the atmosphereUsing paints with lower VOC concentrations to reduce VOC emissionsCCA investigators will incorporate the preceding IR camera video capture in a upcoming follow-up investigation at this facility.,Case Study A Incorporating Multiple Analyses,13,Case Study B VOC Complaints,During December 2008, CCA personnel fielded approximately 16 citizen complaints centering on an adjacent petrochemical complex known for sourcing unplanned emission events. MAAML data showed two unknown peaks in addition to peaks from compounds in the MAAML compound list. Upon completion of a library comparison, the software tentatively identified the peaks as 2,4,4-trimethylpentene (TMP) and 4-vinyl-1-cyclohexene (VCH).A review of plant MSD Sheets and process streams performed by engineers in BAQCs Special Initiatives Section (SI) and compared with collected MAAML data centering upon the two unknown peaks showed a strong correlation to lean oil.,14,Back trajectory at 0130 on 31Dec08,Case Study B VOC Complaints,15,Note: VCH and TMP concentrations are estimates only.Concentration versus time for six compounds (30-31Dec08),Case Study B VOC Complaints,16,In this investigation, the MAAML became a BAQC resource to help in answering citizens air quality complaints.In this role, the MAAML, with its onboard GC/MS instrumentation, independently verified the VOC source. In addition, MLP Chemists also provided a reasonable estimate of the potential hazards associated with the emissions event.All relevant BAQC Sections made important contributions in resolving the citizens complaintsThe efforts of BAQC personnel resulted in plant management accepting a settlement agreement that included stipulated penalties.Historically, the BAQC had documented numerous events of this type from this facility; however, none have occurred since the agreement saw implementation.,Case Study B VOC Complaints,17,Case Study C Affecting Change,Three-plant industrial complex with notable historical styrene releases,18,Timeline for styrene emissions reduction:Early 2008: BAQC identified styrene issue in Milby Park (MP) area based upon compilation of odor complaint history from 2006-8May 2008: BAQC submitted facility permit comments to TCEQ noting need for reduction in styrene emissionsMay June 2008: MAAML monitoring runs indicate continued notable styrene emissionsJuly 2008: TCEQ issued facility permit including a 25% reduction for the styrene hourly limitOctober 2008: BAQC met with TCEQ about styrene issues in MP areaJanuary 2009: TCEQ proposed a styrene Air Pollutant Watch List (APWL) for MP areaApril May 2009: TCEQ and facility established an agreement to reduce styrene emissionsJuly 2009: TCEQ cancelled plans for the styrene APWL due to monitored styrene improvements,Case Study C Affecting Change,19,Back trajectory for a 13.9ppbv styrene emissions hourly average helped showcase the need for the inclusion of styrene as a compound of interest for TCEQ monitoring.,20,Back trajectory for a 12.9ppbv styrene emissions hourly average added to the rationale for styrene inclusion.,21,Case Study C Affecting Change,Graphical representation of styrene emissions reduction over time,22,BAQC & MLP - Additional Successes,The City negotiated an agreement with a local environmental waste processing firm with an established history of nuisance violation emissions.A metal recycling facility agreed to several modification to their plant along with the incorporation of changes to their operational proceduresA prominent dairy processing plant agreed to switch from diesel motors to electric motors for their refrigeration trucks to address citizen complaints about particulates from the diesel motor exhaustsFacilities have markedly reduced or ceased operations upon seeing the MAAML deployed near their facility,23,The Future of Local-Scale Monitoring BAQC,An recent agreement between the City of Houston and the County Attorneys Office for Harris County allows for expansion of MAAML local-scale ambient air monitoringBureau resources can extend Countywide in addressing emissions affecting residents in Houston and surroundingsRecognition of Bureau successes emphasizes the value other agencies have seen in the Citys local-scale air monitoring approach to air quality issues,24,The Future of Local-Scale Monitoring BAQC,The MLP has begun seeking funding to expand MAAML analytical capability to analyze for polar VOCs, a set of compounds not currently available for analysis via the MAAML.This enhancement will allow MLP Chemists to add to the MAAML compound list carbonyls such as methyl ethyl ketone (MEK), a chemical widely used as a solvent for paint applications, especially at a major drum manufacturing facility targeted by the Bureau as a result of numerous citizen complaintsAdditionally, the funding allows the MLP to expand its scope to monitor more facilities that encompass more industriesThe MAAML continues to both demon