A5007474522- Atmospheric chemistry and aerosols
- Air Quality and Health Impacts
- Air Quality Monitoring and Forecasting
- Atmospheric Ozone and Climate
- Spectroscopy and Laser Applications
- Vehicle emissions and performance
- Atmospheric aerosols and clouds
- Atmospheric and Environmental Gas Dynamics
- Toxic Organic Pollutants Impact
- Mercury impact and mitigation studies
- Fire effects on ecosystems
- Gas Sensing Nanomaterials and Sensors
- Analytical Chemistry and Sensors
- Odor and Emission Control Technologies
- Wind and Air Flow Studies
- Industrial Gas Emission Control
- Indoor Air Quality and Microbial Exposure
- Methane Hydrates and Related Phenomena
- Photochemistry and Electron Transfer Studies
- Oil, Gas, and Environmental Issues
- Catalytic Processes in Materials Science
- Free Radicals and Antioxidants
- Smart Materials for Construction
- Environmental and Industrial Safety
New York State Department of Environmental Conservation
2013-2024
New York State Department of Health
2000-2003
Wadsworth Center
2000-2003
Pakistan Space and Upper Atmosphere Research Commission
2002
United States Department of State
2001
Boston College
1996-1998
University of Cambridge
1992-1998
Boston University
1998
University College Dublin
1990-1991
Abstract. Submicron aerosol particles (PM1) were measured in-situ using a High-Resolution Time-of-Flight Aerosol Mass Spectrometer during the summer 2009 Field Intensive Study at Queens College in New York, NY. Organic (OA) and sulfate are two dominant species, accounting for 54% 24%, respectively, of total PM1 mass. The average mass-based size distribution OA presents small mode peaking ~150 nm (Dva) an accumulation (~550 nm) that is internally mixed with sulfate, nitrate, ammonium. diurnal...
This study analyzed the variability of equivalent black carbon (eBC) mass concentrations and their sources in urban Europe to provide insights into use eBC as an advanced air quality (AQ) parameter for AQ standards. compiled concentration datasets covering period between 2006 2022 from 50 measurement stations, including 23 background (UB), 18 traffic (TR), 7 suburban (SUB), 2 regional (RB) sites. The results highlighted need harmonization measurements allow direct comparisons measured across...
A reliable determination of equivalent black carbon (eBC) mass concentrations derived from filter absorption photometers (FAPs) measurements depends on the appropriate quantification cross-section (MAC) for converting coefficient (babs) to eBC. This study investigates spatial–temporal variability MAC obtained simultaneous elemental (EC) and babs performed at 22 sites. We compared different methodologies retrieving eBC integrating options calculating including: locally derived, median value...
Abstract Rate constants for the gas‐phase reactions of hydroxyl radicals and chlorine atoms with aliphatic alcohols ethers have been determined at 298 ± 2 K a total pressure 1 atmosphere. The OH radical rate data were obtained using both absolute technique pulse radiolysis combined kinetic UV spectroscopy conventional photolytic relative method. Cl atom measured only Values in units 10 −12 cm 3 molecule −1 s are: equation image above are based on values 𝓀(OH + c ‐C 6 H 12 ) = 7.49 × 𝓀(Cl 311...
In the United States, residential wood combustion (RWC) is responsible for 7.0% of national primary PM2.5 emissions. Exposure to RWC smoke represents a potential human health hazard. Organic components particles absorb light at 370 nm more effectively than 880 in two-wavelength aethalometer measurements. This enhanced absorption (Delta-C = BC370 – BC880 nm) can serve as an indicator particles. this study, Delta-C data along with measurements molecular markers and potassium were used identify...
Black carbon (BC), an important component of the atmospheric aerosol, has climatic, environmental, and human health significance. In this study, BC was continuously measured using a two-wavelength aethalometer (370 nm 880 nm) in Rochester, New York, from January 2007 to December 2010. The monitoring site is adjacent two major urban highways (I-490 I-590), where 14% 21% total traffic heavy-duty diesel vehicles. annual average concentrations were 0.76 μg/m3, 0.67 0.60 0.52 μg/m3 2007, 2008,...
Previously it has been suggested that certain organic aerosol components of wood smoke have enhanced ultraviolet absorption at 370 nm relative to 880 in two-wavelength aethalometer measurements. This could serve as an indicator burning particles. Two-wavelength (370 and nm) measurements were made urban sites Rochester, New York Laredo, Texas from August 1 December 31, 2009 23, 2007 January 2, 2008, respectively. In Delta-C (UVBC370nm − BC880nm) values higher by a factor 3 during the night...
The absorption cross-sections of trifluoromethyl iodide (CF 3 I), methyl (CH ethyl (C 2 H 5 I) and chloroiodomethane ICl) have been determined over the wavelength range 235–400 nm, with a spectral resolution 0.6 nm (FWHM), using diode array spectrometer. spectra consist broad continuous band maximum (6.0±0.1)×10 -19 cm molecule -1 for CF I at 267 (1.09±0.02)×10 -18 CH 258 (1.18±0.04)×10 C (1.21±0.07)×10 ICl 270 nm. temperature dependence cross-section was investigated 333–243 K. A decline in...
Field evaluations and comparisons of continuous fine particulate matter (PM2,5) mass measurement technologies at an urban a rural site in New York state are performed. The include the filter dynamics system (FDMS) tapered element oscillating microbalance (TEOM) monitor, stand-alone TEOM monitor (without FDMS), beta attenuation (BAM). These methods also compared with 24-hr integrated filters collected analyzed under Federal Reference Method (FRM) protocol. sites City (the borough Queens)...
Measurements of PM2.5 mass and particle components over a 14–15 year period are used to explore trends at urban rural locations across New York State. Such data determine compliance with national ambient air quality standards (NAAQS), as well track the effectiveness reductions in source pollutant emissions. Since 2000 annual mean shows downward trend decreases 4–7 µg m–3 areas versus 3–4 for background sites. Much this change can be attributed sulfate (SO4) nitrate (NO3) which showed 2–3...
Measurements of PM2.5 black carbon (BC) over an 8–9 year period are used to characterize temporal patterns at sites in New York City (NYC) and Rochester, NY. Annual mean BC the NYC location ranges from 1.4 2.0 μg/m3, whereas concentrations Rochester approximately a factor 2–3 lower. amounts 15–20% mass compared 7–10% Rochester. Seasonal reveal highest November February versus June At both locations, weekday (Monday-Friday) statistically higher weekends (Saturday Sunday). Weekday diurnal...
The uptake of gas-phase SO2, H2S, and CO2 by aqueous solutions was studied as a function pH temperature using droplet train flow reactor bubble apparatuses. All three atmospheric species react with H2O OH-, acidifying solutions. Studies yielded the reaction rates OH- mass accommodation coefficient (α) SO2 on water temperature. second-order aqueous-phase rate coefficients at 291 K for H2S are (1.1 ± 0.2) × 1010, (1.7 109, (4.0 0.7) 103 M-1 s-1, respectively. As far we can determine, have been...
Measurement methods for fine carbonaceous aerosol were compared under field sampling conditions in Flushing, New York during the period of January and early February 2004. In-situ 5- to 60-minute average PM 2.5 organic carbon (OC), elemental (EC), black (BC) concentrations obtained by following methods: Sunset Laboratory OC/EC analyzer, Rupprecht Patashnick (R&P) series 5400 ambient particulate monitor, Aerodyne mass spectrometer (AMS) total matter (OM), a two-wavelength AE-20 Aethalometer....
During the last two winters widespread fog frequently occurred in northeastern India and Pakistan, a region extending over 1500 km. A particularly severe episode lasted from mid‐December, 1998 to early January, 1999. The caused extensive economic damage disruptions transport. We determined concentrations of SO 4 2− , NO 3 − selected trace elements at Lahore, Pakistan during after event by collecting aerosols on Whatman 41 filters every 12 h. up 100 µg/m³ were observed fog. /Se ratios element...
[1] Measurements of black carbon (BC) were made at two sites in New York City during the winter 2004 and are compared. Spatial temporal variability concentrations explored by examining diurnal, weekday/weekend, day-of-week trends these sites. It was observed that BC tracked PM2.5 well Queens site contributed about 8% to fine particle mass measured this site. At IS 52 site, however, did not track as accounted for a slightly higher 11% total mass. Diurnal behavior weekdays weekends consistent...
Abstract Several collocated semicontinuous instruments measuring particulate matter with particle sizes ≤2.5 μm (PM2.5) sulfate (SO4 22−) and nitrate (NO3 −) were intercompared during two intensive field campaigns as part of the PM2.5 Technology Assessment Characterization Study. The summer 2001 urban campaign in Queens, NY, 2002 rural upstate New York (Whiteface Mountain) hosted an operation Aerosol Mass Spectrometer, Ambient Particulate Sulfate Nitrate Monitors, a Continuous Monitor,...
Long-term records of condensed-phase chemical data are presented from the Adirondack Mountain region northern New York, USA. These particularly valuable due to combinations aerosol, cloud, and precipitation measurements. Objectives research this overview paper include evaluation emission reductions regulated air pollutants observed effects on measured deposition, as well implications changing pollutant concentration levels human health climate. Summer season cloud chemistry year-round wet...