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Walter Ham is listed as Chief, Monitoring and Laboratory Division at California Air Resources Board, a with 956 employees, based in Davis, California, United States. AeroLeads shows a work email signal at arb.ca.gov and a matched LinkedIn profile for Walter Ham.
Walter Ham previously worked as Branch Chief, Diesel Programs Enforcement Branch at California Air Resources Board and Air Resources Supervisor I, Advanced Monitoring Techniques Section at California Air Resources Board. Walter Ham holds Phd, Civil & Environmental Engineering from University Of California, Davis.
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My research involves performing field, laboratory, and modeling experiments to characterize ambient air pollution to answer several important questions: What types of air pollution are most important for human health effects? What are the sources and/or formation pathways that create harmful air pollution? What physical or chemical factors are important for human exposure to air pollution? How can we reduce the effects of harmful air pollution on human health?Specialties: Air Pollution, Atmospheric Chemistry, Chemical Safety, Dosimetry, Source Apportionment, Electrostatics, Pesticides, Ozone, Environmental Chemistry, Environmental Toxicology, Inhalation Toxicology, Inorganic Chemistry, Organic Chemistry, Quality Control / Quality Assurance,
Listed skills include Air Quality, Air Pollution, Environmental Chemistry, Environmental Awareness, and 19 others.
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Oversee a multi-disciplinary staff in the monitoring of air pollution, development and implementation of emission reduction strategies for criteria and toxic pollutants and greenhouse gases from mobile and stationary emission sources, including small off-road engines, fueling systems and other division programs such as abrasive blasting.
Sacramento, California, United States
Branch Chief, Diesel Programs Enforcement BranchThe Diesel Programs Enforcement Branch (DPEB) is responsible for enforcing California Air Resources Board (CARB) regulations designed to improve air quality by reducing emissions generated by diesel-powered trucks, buses, and special purpose equipment, including diesel-powered transport refrigeration units (TRUs), diesel-powered construction, mining, and airport ground support equipment, and other types of off-road, self-propelled, diesel-powered equipment. DPEB consists of five sections: 1) the Statewide Truck and Bus Enforcement Section, 2) the Specialized Fleet Enforcement Section, 3) the Diesel Equipment Enforcement Section, 4) the Freight Hub Enforcement Section, and 5) the Data Operations Section.
Sacramento, California Area
Manager of the Advanced Monitoring Techniques Section (AMTS), Monitoring and Laboratory DivisionAMTS is responsible for implementing community air monitoring programs under AB 617, conducting air monitoring technology evaluations, and conducting the Study of Neighborhood Air Near Petroleum Sources (SNAPS). AMTS uses a variety of monitoring methods including traditional monitoring methods, low-cost sensors, mobile monitoring, and remote sensing to better characterize air quality at the community scale.
Sacramento, California Area
Member of the Measurement Assessment and Research Section, Monitoring and Laboratory DivisionProjects:PEAQS - Portable Emissions AcQuisition System: Real-time emissions probe system to remotely quantify emissions factors of mobile sources. Designed and constructed a roadside emissions plume capture, data acquisition system, and database infrastructure to measure PM, BC, UFP, CO, NOx, SOx, and GHG emissions from HDDVs and LDVs in real-time. Python-based system now includes computer vision and machine learning tools to enhance real-time feedback for rapid screening and decision making.Heavy Duty OBD: Engineer for J1939 data collection HD emissions testing, probe sensing, and portable emissions measurement testing. Developing Python-based API for J1939 and other CAN-BUS systems to collect OBD data and telemetry.PEMS Analytics Development: Developing analytical methodologies for analysis of high resolution PEMS data.Low-cost sensors: Serve as in-house researcher on next generation air monitoring, low-cost sensors, and sensing technologies through collaborations with external agencies and investigators. Internal projects include low-cost PEMS, opacity, aethalometer, and remote sensing systems.
Sacramento, California Area
Member of Emissions and Exposure Research Section, Research Division.Projects:PEAQS - Portable Emissions AcQuisition System: Real-time emissions probe system to remotely quantify emissions factors of mobile sources. Designed and constructed a roadside emissions plume capture, data acquisition system, and database infrastructure to measure PM, BC, UFP, CO, NOx, SOx, and GHG emissions from HDDVs and LDVs in real-time.MMP - Mobile Measurement Platform: Utilize mobile measurement techniques to measure on-road and inter-community air pollution. These studies focus on on-road emissions reductions of black carbon due to rule benefits, quantify greenhouse gas emissions, and assess community exposures. Studies also include high emitter chase studies, intra-community variability, and source apportionment.Commuter Exposure: Conducted field studies to characterize air pollution exposures experienced by California commuters utilizing different modes of transportation. This study utilizes a variety of handheld, low-cost equipment to quantify microenvironmental exposures of commuters to BC, PM, UFP, CO, and NOx.Low-cost sensors: Serve as in-house researcher on next generation air monitoring, low-cost sensors, and sensing technologies through collaborations with external agencies and investigators.Contracts:Soundwall: Manage a research contract investigating the use of soundwalls and vegetative soundwalls as tools for near-roadway air pollution mitigation. This study utilizes a combination of stationary measurements, mobile measurements, and micro-scale models to provide state and local planners with additional tools for near-roadway mitigation options.
Investigated the effect of size-resolved particulate matter on platelet activation using platelet aggregometry. Developed a biologically compatible extraction technique for removing particulate matter from Teflon filter substrates. Utilized a catalog of size-resolved PM filters and extracts with known concentrations of metals, ions, OC/EC, and PAHs to examine the effect of sources, size, and chemical speciation on platelet activation. Conducted statistical tests to compare size-resolved platelet activation to known toxicological contaminants, PM speciation, particle size, dosimetry, and particle sources. Source specific filter extracts (automobile, wood smoke, meat-cooking) and secondary organic aerosol will also be analyzed for toxicological effects.
Designed, built, and tested ~6m3 ozone chamber for ozone formation studies. Performed laboratory smog chamber studies to quantify ozone formation of pesticides at low NOx conditions (<20 ppbv). Conducted field experiments to collect VOCs from compost facilities to quantify VOC emissions and measure ozone formation using a portable ozone chamber. Modified an ozone box model using the SAPRC-99 and SAPRC-07 chemical mechanisms to estimate ozone formation potential for various pesticide solvents and agricultural sources to verify laboratory and field measurements. Calculated incremental reactivities for pesticide solvents of interest. Performed a pilot study to measure VOC and NOx emissions from agricultural silage for ozone formation potential studies.
Utilized Micro-Orifice Uniform Deposit Impactors, Reference Ambient Air Samplers, Particle into Liquid Samplers, Scanning Mobility Particle Sizers, and Aerodynamic Particle Sizers to collect ambient air quality filter samples and real-time measurements in support of on-going live animal health effects studies for the UC Davis EPA PM Center. Analyzed PM1.8 filter samples with various laboratory techniques including gravimetry, organic / elemental carbon, water soluble ions, trace metals, and PAHs. Incorporated size-resolved speciation data into lung deposition models to estimate human exposure. Performed an intercomparison study in which six national labs were tasked with analyzing co-located filters to examine the differences between reported X-Ray Fluorescence and Inductively-Coupled Plasma Mass Spectrometry data for metals analyses. Performed a molecular marker chemical mass balance source apportionment analysis to determine the source origin and impacts of sources relevant to air quality field studies.
Applied Electrostatics Laboratory
Assisted in construction and maintenance of a pilot scale ozone/UV water purification system for process waters. Performed water quality assessment techniques (Total Suspended Solids, % dissolved Oxygen, dissolved ions, metals, organic fraction). Calibrated and maintained water quality sensor and control units (turbidity sensors, flow meters, rotameters, hot-film anemometers, solids removal). Tested electrostatic spray nozzle system for liquid film applications .
Southeast Poultry Research Laboratory
Aided in the development of an electrostatic space charge system to improve air quality in poultry production houses. Researched materials and configurations for optimum electrostatic space charge. Wrote computer programs and Excel macros for analyzing raw data from data loggers. Assisted in the development of an electrostatic air sampling device to collect ambient particulate matter onto Petri dishes for bacterial analysis.
Certificate in Air Quality and Health
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Walter Ham works for California Air Resources Board.
Walter Ham is listed as Chief, Monitoring and Laboratory Division at California Air Resources Board.
AeroLeads has found 1 work email signal at @arb.ca.gov for Walter Ham at California Air Resources Board.
Walter Ham is based in Davis, California, United States while working with California Air Resources Board.
Walter Ham has worked for California Air Resources Board, Uc Davis, University Of Georgia, and Usda-Ars-Seprl.
You can use AeroLeads to view verified contact signals for Walter Ham at California Air Resources Board, including work email, phone, and LinkedIn data when available.
Walter Ham holds Phd, Civil & Environmental Engineering from University Of California, Davis.
Walter Ham is listed with skills including Air Quality, Air Pollution, Environmental Chemistry, Environmental Awareness, Water, Atmospheric Chemistry, Inorganic Chemistry, and Organic Chemistry.
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