John G. Watson
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View article: Sizing Accuracy of Low-Cost Optical Particle Sensors Under Controlled Laboratory Conditions
Sizing Accuracy of Low-Cost Optical Particle Sensors Under Controlled Laboratory Conditions Open
Low-cost particulate matter sensors have seen increased use for monitoring at personal and local levels due to their affordability, ease of operation, and high time resolution. However, the quality of data reported by these sensors can be …
View article: Energies Within Rock Mass and the Associated Dynamic Rock Failures
Energies Within Rock Mass and the Associated Dynamic Rock Failures Open
Catastrophic dynamic rock failure is one of the most challenging problems existing in the fields of civil tunneling and mining. It occurs in complex environments of geology, stress and excavation, and there is no one set of circumstances t…
View article: Coal Mine Dust Size Distributions, Chemical Compositions, and Source Apportionment
Coal Mine Dust Size Distributions, Chemical Compositions, and Source Apportionment Open
Current regulations mandate the monitoring of respirable coal mine dust (RCMD) mass and crystalline silica in underground coal mines to safeguard miner health. However, other RCMD characteristics, such as particle size and chemical composi…
View article: Characterization of Lithium-Ion Battery Fire Emissions—Part 2: Particle Size Distributions and Emission Factors
Characterization of Lithium-Ion Battery Fire Emissions—Part 2: Particle Size Distributions and Emission Factors Open
The lithium-ion battery (LIB) thermal runaway (TR) emits a wide size range of particles with diverse chemical compositions. When inhaled, these particles can cause serious adverse health effects. This study measured the size distributions …
View article: Characterization of Lithium-Ion Battery Fire Emissions—Part 1: Chemical Composition of Fine Particles (PM2.5)
Characterization of Lithium-Ion Battery Fire Emissions—Part 1: Chemical Composition of Fine Particles (PM2.5) Open
Lithium-ion batteries (LIB) pose a safety risk due to their high specific energy density and toxic ingredients. Fire caused by LIB thermal runaway (TR) can be catastrophic within enclosed spaces where emission ventilation or occupant evacu…
View article: Community-centered instrumentation and monitoring of nature-based solutions for urban stormwater control
Community-centered instrumentation and monitoring of nature-based solutions for urban stormwater control Open
Climate change is increasing the frequency and severity of extreme precipitation events, requiring new ways of managing stormwater, particularly in urban areas. Nature-based solutions (NBS) have become increasingly popular to provide distr…
View article: Diversity and Complexity: examining the characteristics of 'at risk' and homeless households in Melbourne's West
Diversity and Complexity: examining the characteristics of 'at risk' and homeless households in Melbourne's West Open
This report prepared by the Unison Housing Research Lab examines de-identified data on 2933 households who were supported by Unison's Initial Assessment and Planning (IAP) service during the financial year 2016/2017. The report answers thr…
View article: Chemically speciated air pollutant emissions from open burning of household solid waste from South Africa
Chemically speciated air pollutant emissions from open burning of household solid waste from South Africa Open
Open burning of household solid waste is a large source of air pollutants worldwide, especially in the Global South. However, waste burning emissions are either missing or have large uncertainties in local, regional, or global emission inv…
View article: Comment on egusphere-2023-2089
Comment on egusphere-2023-2089 Open
Abstract. Open burning of household solid waste is a large source of air pollutants worldwide, especially in developing countries. However, waste burning emissions are either missing or have large uncertainties in local, regional, or globa…
View article: Comment on egusphere-2023-2089
Comment on egusphere-2023-2089 Open
Abstract. Open burning of household solid waste is a large source of air pollutants worldwide, especially in developing countries. However, waste burning emissions are either missing or have large uncertainties in local, regional, or globa…
View article: Environmental sampling for disease surveillance: Recent advances and recommendations for best practice
Environmental sampling for disease surveillance: Recent advances and recommendations for best practice Open
Environmental sampling for disease surveillance: Recent advances and recommendations for best practice
View article: Chemically Speciated Air Pollutant Emissions from Open Burning of Household Solid Waste from South Africa
Chemically Speciated Air Pollutant Emissions from Open Burning of Household Solid Waste from South Africa Open
Open burning of household solid waste is a large source of air pollutants worldwide, especially in developing countries. However, waste burning emissions are either missing or have large uncertainties in local, regional, or global emission…
View article: Supplementary material to "Chemically Speciated Air Pollutant Emissions from Open Burning of Household Solid Waste from South Africa"
Supplementary material to "Chemically Speciated Air Pollutant Emissions from Open Burning of Household Solid Waste from South Africa" Open
Mass closure, a comparison of the reconstructed mass and sum of measured species with gravimetric mass, is an indicator of the data quality.It also provides information about key chemical composition and potential sources of PM2.5 (Chow et…
View article: Particulate matter phthalate, polycyclic aromatic hydrocarbons, and toxic metal concentrations in tailpipe and non-tailpipe emissions near highways
Particulate matter phthalate, polycyclic aromatic hydrocarbons, and toxic metal concentrations in tailpipe and non-tailpipe emissions near highways Open
BACKGROUND AND AIM: Highway emissions are large contributors to particulate matter exposures. METHOD: PM2.5 and PM10 filter samples were collected upwind and downwind of two southern California highways and analyzed for phthalates, potenti…
View article: Characterization of gas and particle emissions from open burning of household solid waste from South Africa
Characterization of gas and particle emissions from open burning of household solid waste from South Africa Open
Open burning of household and municipal solid waste is a frequent practice in many developing countries. Due to limited resources for collection and proper disposal, solid waste is often disposed of in neighborhoods and open-burned in pile…
View article: Comment on egusphere-2023-866
Comment on egusphere-2023-866 Open
Abstract. Open burning of household and municipal solid waste is a common practice in many developing countries. Due to limited resources for collection and proper disposal, solid waste is often disposed of in neighborhoods and open burned…
View article: Characterization of Gas and Particle Emissions from Open Burning of Household Solid Waste
Characterization of Gas and Particle Emissions from Open Burning of Household Solid Waste Open
Open burning of household and municipal solid waste is a common practice in many developing countries. Due to limited resources for collection and proper disposal, solid waste is often disposed of in neighborhoods and open burned in piles …
View article: Instrumentation and Monitoring of Nature-Based Solutions for Urban Stormwater Control
Instrumentation and Monitoring of Nature-Based Solutions for Urban Stormwater Control Open
Climate change is leading to more extreme precipitation events, which require new ways of managing stormwater, particularly in urban areas. Nature-based solutions (NBS) have become an increasingly popular way of providing additional stormw…
View article: Issues with the Organic and Elemental Carbon Fractions in Recent U.S. Chemical Speciation Network Data
Issues with the Organic and Elemental Carbon Fractions in Recent U.S. Chemical Speciation Network Data Open
The carbon fractions of organic (OC1, OC2, OC3, OC4, OP) and elemental (EC1, EC2, and EC3) carbon obtained from IMPROVE (Interagency Monitoring of PROtected Visual Environments) thermal/optical carbon analysis of quartz-fiber filters have …
View article: Quantitative assessment of energy changes in underground coal excavations using numerical approach
Quantitative assessment of energy changes in underground coal excavations using numerical approach Open
Coal burst is caused by a dynamic and unstable release of energy within the overstressed rock mass/coal during the mining process. Although the occurrence of coal burst is a result of the complex impacts of many factors, a major component …
View article: Evidence of non-tailpipe emission contributions to PM2.5 and PM10 near southern California highways
Evidence of non-tailpipe emission contributions to PM2.5 and PM10 near southern California highways Open
Particulate Matter (PM) concentrations near highways are influenced by vehicle tailpipe and non-tailpipe emissions, other emission sources, and urban background aerosols. This study collected PM2.5 and PM10 filter samples near two southern…
View article: Review of Filters for Air Sampling and Chemical Analysis in Mining Workplaces
Review of Filters for Air Sampling and Chemical Analysis in Mining Workplaces Open
This review considers the use of filters to sample air in mining workplace environments for dust concentration measurement and subsequent analysis of hazardous contaminants, especially respirable crystalline silica (RCS) on filters compati…