Garabedian H.,Energy and Environmental Analytics |
Skelton E.,Northeast Diesel Collaborative |
Miller P.,NESCAUM |
Balon T.,M.J. Bradley and Associates LLC
EM: Air and Waste Management Association's Magazine for Environmental Managers | Year: 2010
The NEDC now has a successful track record of demonstrating first-in-the-nation pilot projects and innovative policies and programs leading to cleaner diesel technologies and practices. With the combined experience of EPA, state air quality agencies, and private-sector participants, the NEDC is now pursuing new opportunities to demonstrate cleaner technologies in a variety of marine vessel applications, such as tugboats, ferries, and excursion vessels. Notable among these is a demonstration project that will repower a vessel older than the Titanic. By openly taking on these engineering challenges, the NEDC is demonstrating not only the viability of cleaner engines and fuels on every-day workhorses like tugboats and ferries, but also that repowering works for older vessels from a bygone era. With newer, cleaner, more fuel-efficient engines, these projects are reducing air pollution and lowering fuel costs while extending the operating lifetime of these ships for years to come. Copyright 2010 Air & Waste Management Association.
Allen G.A.,NESCAUM |
Miller P.J.,NESCAUM |
Rector L.J.,NESCAUM |
Brauer M.,University of British Columbia |
Su J.G.,University of California at Berkeley
Aerosol and Air Quality Research | Year: 2011
The increasing popularity of wood fired heating appliances in cold winter climates has focused attention on assessment of woodsmoke exposures. Pollution from residential wood combustion (RWC) is a major concern in areas with valley topography where nighttime inversions limit the dispersion of pollutants from ground-level sources. An intensive characterization of ambient particulate mater (PM) from RWC was performed in northern New York State during winter 2008-2009 in an area where the 2005 U.S. EPA National Emissions Inventory shows RWC to be the largest source of PM2.5. Measurements of woodsmoke PM were made using optical scattering and absorption techniques during repeated night-time mobile monitoring to provide data with high spatial and temporal resolution; measurements were also made at six fixed sites for the study period to provide temporal context for the mobile measurements. The difference in optical absorption at near-infrared and near-ultraviolet wavelengths was used as a specific marker for wood smoke PM. Wood smoke was the only significant contributor to elevated night-time valley PM concentrations during mobile run nights; short-term (3 minute) PM concentrations frequently exceeded 100 μg/m3. Concentrations observed with mobile monitoring were consistently elevated at valley bottoms where the majority of the population lives, and approached zero outside of valleys. Data from fixed sites indicated that woodsmoke levels peaked near midnight, with a secondary peak around 7 AM and a mid-day minimum. These patterns are consistent with RWC use and diurnal patterns of atmospheric dispersion. © Taiwan Association for Aerosol Research.