Characteristics of Haze Pollution Events During Biomass Burning Period at an Upwind Site of Delhi

Journal of Geophysical Research Atmospheres, Journal Year: 2025, Volume and Issue: 130(7)

Published: April 8, 2025

Abstract The National Capital Region (NCR) of Delhi frequently experiences severe haze episodes during the post‐monsoon and winter months, driven by long‐range transport biomass burning aerosols, local emissions, unfavorable meteorological conditions. However, observational studies tracing these pollution along pathway to are lacking. This study investigates at an upwind site in Sonipat using advanced instrumentation October 25 15 November 2023, encompassing Diwali events. Sudden spikes pollutants caused haze, temporary reductions due rainfall, a resurgence Diwali. Two major were identified, with particulate matter (PM 2.5 ) levels exceeding 300 μg/m 3 . Organics dominated composition based PM (C‐PM followed Black Carbon (BC), jointly accounting for ∼80% total mass all episodes, secondary inorganics contributed minimally. Limited day‐night variations low contribution suggested minimal photochemical activity formation. Elevated tracers emission ratios indicated aged, oxidized aerosols from crop residue Punjab Haryana, supported fire count data 72‐hr backward trajectory analysis. Regional meteorology, including shallow atmospheric boundary layer (ABL) wind speeds, hindered pollutant dispersion, leading accumulation prolonged haze. By integrating analysis, factors, dynamics, this provides critical insights into formation, emphasizing need targeted mitigation strategies, such as stricter controls improved management, address its health risks effectively.

Language: Английский

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Short-Term Exposure to PM10 and Black Carbon in Residential Microenvironments in Bragança, Portugal: A Case Study in Bedrooms, Living Rooms, and Kitchens

Atmosphere, Journal Year: 2023, Volume and Issue: 14(7), P. 1064 - 1064

Published: June 23, 2023

Several studies have evaluated PM concentrations in single specific microenvironments as a measure of exposure the entire house. In this study, PM10 was monitored at same time three (bedroom, living room, and kitchen) from dwellings located small inland town Iberian Peninsula to assess whether varies significantly between them. Real-time optical instruments low-volume gravimetric samplers were employed. A multi-wavelength absorption instrument used determine black carbon (BC) on filters. The Multiple-Path Particle Dosimetry Model (MPPD) applied evaluate deposition BC airways adults. For all dwellings, highest recorded bedrooms (B1 = 22.7 µg m−3; B2 19.5 B3 68.1 m−3). Houses 1 3 did not show significant differences microenvironments. This happen house 2, suggesting that ventilation is determining factor for concentrations. originated mainly fossil fuel emissions (90%), while biomass burning represented minor contribution (10%). MPPD showed predominantly deposited head region (≥85% total dose), pulmonary (14%). Higher doses estimated males than females.

Language: Английский

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Chemical Speciation and Oxidative Potential of Pm10 in Different Residential Microenvironments: Bedroom, Living Room and Kitchen

Published: Jan. 1, 2024

Exposure to particulate matter (PM) and its chemical constituents in residential microenvironments has become a major health concern worldwide. The oxidative potential (OP) been proposed as metric for estimating the PM capacity induce stress and, consequently, effects. In present study, PM10 was monitored simultaneously bedroom, living room kitchen from three dwellings located small inland town of Portugal perform detailed characterisation organic inorganic determination OP using dithiothreitol (DTT) ascorbic acid (AA) acellular assays. Photometric devices low-volume gravimetric samplers were employed. Bedrooms found be hotspot concentrations (B1 = 22.7 ± 4.56; B2 19.5 6.33; B3 68.1 38.3 µg m-3). PM10-bound elements varied significantly between all dwellings. Lower molecular weight polycyclic aromatic hydrocarbons (PAHs) 14 72 times higher than high PAHs bedrooms. average volume-normalised determined by DTT AA assays within 0.01-0.38 0.03-0.53 nmol min−1 m-3 ranges, respectively. Quinones, oxy-aromatic, alkyl-aromatic compounds stood out bedrooms exhibiting significant correlations with assays, Strong positive relationship black carbon, Cu Br observed, indicating common redox active species mainly associated traffic emissions. Sr, Fe, Zn Zr presented dwelling 3, an excellent correlation OP, that Sahara dust intrusion recorded during sampling period house may have contributed formation more thought drive antioxidant depletion responses.

Language: Английский

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Chemical speciation and oxidative potential of PM10 in different residential microenvironments: bedroom, living room and kitchen

Building and Environment, Journal Year: 2024, Volume and Issue: 267, P. 112181 - 112181

Published: Oct. 10, 2024

Language: Английский

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