Unexpected High Contribution of Residential Biomass Burning to Non‐Methane Organic Gases (NMOGs) in the Yangtze River Delta Region of China

Journal of Geophysical Research Atmospheres, Journal Year: 2022, Volume and Issue: 127(4)

Published: Jan. 24, 2022

Abstract Residential biomass burning (BB) plays an important role in the generation of household energy rural China and can contribute to degradation regional air quality. Here, unexpectedly strong residential BB emissions were identified during EXPeriment on eLucidation atmospheric Oxidation capacity aerosol foRmation, their Effects Yangtze River Delta (YRD) campaign area Eastern based early summertime measurements non‐methane organic gases (NMOGs) by a Proton Transfer Reaction‐Quadruple Time‐of‐Flight Mass Spectrometer. These widespread long‐lasting feature high levels acetonitrile, oxygenated‐aromatics, naphthalene, are independent characteristic from open field but relate miscellaneous fuels such as combustible wastes. The positive matrix factorization approach was applied quantitatively appoint sources understand OH reactivity ( L ) secondary aerosols formation potential (SOAP) atmosphere China. We find that accounts for 24.0% ± 6.4% all NMOG mixing ratios, compared 40.1% 7.7% urban emissions. contribution these two total calculated (23.2% 6.2% 26.4% 5.1% urban) SOAP (22.0% 7.5% 23.2% 6.7% comparable normal days. In addition, biogenic sporadic also NMOGs YRD region harvest season. This study highlights critical importance China, which unaccounted past pollution regulations.

Language: Английский

---

NO<sub>3</sub> chemistry of wildfire emissions: a kinetic study of the gas-phase reactions of furans with the NO<sub>3</sub> radical

Atmospheric chemistry and physics, Journal Year: 2022, Volume and Issue: 22(3), P. 1761 - 1772

Published: Feb. 4, 2022

Abstract. Furans are emitted to the atmosphere during biomass burning from pyrolysis of cellulose. They one major contributing volatile organic compound (VOC) classes OH and NO3 reactivity in plumes. The removal process furans at night is reaction with nitrate radical, NO3. Here, we report a series relative rate experiments 7300 L indoor simulation chamber Institut de Combustion Aérothermique Réactivité et Environnement, Centre national la recherche scientifique (ICARE-CNRS), Orléans, using number different reference compounds determine coefficients for four furans, two furanones, pyrrole. In case this first time that have been reported. recommended values (cm3 molec.−1 s−1) as follows: furan, (1.49 ± 0.23) × 10−12; 2-methylfuran, (2.26 0.52) 10−11; 2,5-dimethylfuran, (1.02 0.31) 10−10; furfural (furan-2-aldehyde), (9.07 2.3) 10−14; α-angelicalactone (5-methyl-2(3H)-furanone), (3.01 0.45) γ-crotonolactone (2(5H)-furanone), <1.4 10−16; pyrrole, (6.94 1.9) 10−11. + coefficient found be an order magnitude smaller than previously These show alkyl-substituted α-angelicalactone, will dominant may also contribute day. For γ-crotonolactone, not important atmospheric sink.

Language: Английский

---

Secondary aerosol formation during the dark oxidation of residential biomass burning emissions

Environmental Science Atmospheres, Journal Year: 2022, Volume and Issue: 2(5), P. 1221 - 1236

Published: Jan. 1, 2022

Particulate matter from biomass burning emissions affects air quality, ecosystems and climate; however, quantifying these effects requires that the connection between primary secondary aerosol production is firmly established. We performed atmospheric simulation chamber experiments on chemical oxidation of residential under dark conditions. Biomass organic was found to age conditions, with its oxygen-to-carbon ratio increasing by 7-34% producing 1-38 μg m-3 (5-80% increase over fresh aerosol) after 30 min exposure NO3 radicals in (corresponding 1-3 h typical nighttime radical concentrations an urban environment). The average mass concentration SOA formed dark-oxidation conditions comparable 3 (equivalent 7-10 ambient exposure) ultraviolet lights (6 or a 47% emitted concentration). dark-aging showed substantial nitrate (0.12-3.8 m-3), 46-100% which form nitrates. pH remained practically constant at 2.8 throughout experiment. This value promotes inorganic partitioning particulate phase, potentially contributing buildup boundary layer enhancing long-range transport. These results suggest through reactions additional formation pathway emission plumes should be accounted for chemical-transport models.

Language: Английский

---

Effects of Relative Humidity on Time-Resolved Molecular Characterization of Secondary Organic Aerosols from the OH-Initiated Oxidation of Cresol in the Presence of NO_x

Environmental Science & Technology, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 16, 2025

While biomass burning (BB) is the largest source of fine particles in atmosphere, influence relative humidity (RH) and photochemistry on BB secondary organic aerosol (BB-SOA) formation aging remains poorly constrained. These effects need to be addressed better capture comprehend evolution BB-SOA atmosphere. Cresol (C7H8O) used as a proxy investigate these effects. It emitted directly from has been identified significant SOA precursor residential wood-burning emissions. The gas- particle-phase signal intensities are investigated using online mass spectrometers. An increase yield 7% observed when RH rises 0.5–20 70–87%. At elevated RH, nitrogen-containing compounds due processes. This linked net decrease viscosity, enabling formed greater extent at presence nitrogen oxides. results highlight importance particle water content for molecular compounds.

Language: Английский

---

Effect of operating conditions and technology on residential wood stove emissions of criteria, greenhouse gas, and hazardous air pollutants

Journal of the Air & Waste Management Association, Journal Year: 2025, Volume and Issue: unknown

Published: April 15, 2025

Pollution from cordwood stoves includes fine particulate matter (PM), hazardous air pollutants (HAPs), greenhouse gases (GHGs), and other compounds that impact human health climate. To better understand emissions under typical homeowner use patterns, we tested five U.S. (four meeting 2020 New Source Performance Standards (NSPS) one pre-NSPS, circa 1980 stove) across three technology types using the novel Integrated Duty Cycle (IDC) protocol. We report factors by IDC phase, which represent "real world" operating conditions (such as "start-up," "high heat," "overnight burn") fuel loading patterns. evaluated effect of dry burn rate on PM, HAP GHG determined significant effects phase in uncertified catalytic/hybrid stove emissions, but not noncatalytic stoves. This has important implications for quality science, policy, design, different climate zones will influence number starts, frequencies phases.

Language: Английский

---