A5014972654- Atmospheric chemistry and aerosols
- Air Quality and Health Impacts
- Air Quality Monitoring and Forecasting
- Atmospheric aerosols and clouds
- Toxic Organic Pollutants Impact
- Vehicle emissions and performance
- Atmospheric Ozone and Climate
- COVID-19 impact on air quality
- Cyclone Separators and Fluid Dynamics
- Infrastructure Maintenance and Monitoring
- Chemical Thermodynamics and Molecular Structure
- Concrete and Cement Materials Research
- Atmospheric and Environmental Gas Dynamics
- Sustainability in Higher Education
- Energy, Environment, and Transportation Policies
- Historical and Modern Theater Studies
- Metabolism and Genetic Disorders
- Spanish Culture and Identity
- Environmental Sustainability in Business
- Clinical Nutrition and Gastroenterology
- Innovation and Socioeconomic Development
- Municipal Solid Waste Management
- Radioactive contamination and transfer
- Advanced Aircraft Design and Technologies
- Thermal and Kinetic Analysis
Tecnológico de Monterrey
2023-2025
University of Manchester
2016-2025
Physical Research Laboratory
2022
National Centre for Atmospheric Science
2018
Food-cooking organic aerosols (COA) are one of the primary sources submicron particulate matter in urban environments. However, there still many questions surrounding source apportionment related to instrumentation as well semivolatile partitioning because COA evolve rapidly ambient air, making more complex. Online measurements emissions from cooking different types food were performed a laboratory characterize particles and gases. Aerosol mass spectrometer (AMS) showed that relative...
Abstract Anthropogenic biomass burning is poorly represented in models due to a lack of observational data but represents significant source short‐lived toxic gases. Guy Fawkes Night (bonfire night) regular UK‐wide event where open fires are lit and fireworks set off on 5 November. Previous gas phase studies bonfire night focus persistent organic pollutants primarily using off‐line techniques. Here the first simultaneous online measurements several classes compounds including isocyanates,...
Abstract. The multilinear engine (ME-2) factorization tool is being widely used following the recent development of Source Finder (SoFi) interface at Paul Scherrer Institute. However, success this tool, when using a value approach, largely depends on inputs (i.e. target profiles) applied as well experience user. A strategy to explore solution space proposed, in which that best describes organic aerosol (OA) sources determined according systematic application predefined statistical tests....
Abstract. A number of inorganic (nitryl chloride, ClNO2; chlorine, Cl2; and hypochlorous acid, HOCl) chlorinated, oxygenated volatile organic compounds (ClOVOCs) have been measured in Manchester, UK during October November 2014 using time-of-flight chemical ionisation mass spectrometry (ToF-CIMS) with the I− reagent ion. ClOVOCs appear to be mostly photochemical origin, although direct emission from vehicles is also suggested. Peak concentrations ClNO2, Cl2 HOCl reach 506, 16 9 ppt...
Rapid economic growth and development have exacerbated air quality problems across India, driven by many poorly understood pollution sources understanding their relative importance remains critical to characterising the key drivers of pollution. A comprehensive suite measurements 90 non-methane hydrocarbons (NMHCs) (C2-C14), including 12 speciated monoterpenes higher molecular weight monoaromatics, were made at an urban site in Old Delhi during pre-monsoon (28-May 05-Jun 2018) post-monsoon...
Abstract. We present the first real-time composition of submicron particulate matter (PM1) in Old Delhi using high-resolution aerosol mass spectrometry (HR-AMS). is one most polluted locations world, and PM1 concentrations reached ∼ 750 µg m−3 during period, post-monsoon where increased by 188 % over pre-monsoon period. Sulfate contributes largest inorganic fraction (24 %) monsoon periods, with nitrate contributing period (8 %). The organics dominate (54 %–68 throughout three and, positive...
The climate effects of atmospheric aerosol particles serving as cloud condensation nuclei (CCN) depend on chemical composition and hygroscopicity, which are highly variable spatial temporal scales. Here we present global CCN measurements, covering diverse environments from pristine to polluted conditions. We show that the effective κ, can be derived accurately fine mass fractions organic particulate matter (ϵorg) inorganic ions (ϵinorg) through a linear combination, κ = ϵorg ⋅ κorg + ϵinorg...
Abstract. Over the past decade, there has been an increasing interest in short-term events that negatively affect air quality such as bonfires and fireworks. High aerosol gas concentrations generated from public or fireworks were measured order to understand night-time chemical processes their atmospheric implications. Nitrogen chemistry was observed during Bonfire Night with nitrogen containing compounds both phases further N2O5 ClNO2 concentrations, which depleted early next morning due...
Abstract. Polycyclic aromatic hydrocarbons (PAHs) are ubiquitous pollutants in air, soil, and water known to have harmful effects on human health the environment. The diurnal nocturnal variations of 17 PAHs ambient particle-bound were measured urban Beijing (China) Delhi (India) during summer season using gas-chromatography–quadrupole time-of-flight mass spectrometry (GC-Q-TOF-MS). mean concentration particles less than 2.5 µm (PM2.5) observed was 3.6 times higher measurement period both...
Abstract. Air pollution in urban environments has been shown to have a negative impact on air quality and human health, particularly megacities. Over recent decades, Delhi, India, suffered high atmospheric pollution, with significant particulate matter (PM) concentrations as result of anthropogenic activities. Organic aerosols (OAs) are composed thousands different chemical species one the main constituents submicron particles. However, quantitative knowledge OA composition, their sources...
Abstract Wintertime non-refractory submicron particulate matter (NR-PM 1 ) species were measured in Delhi with an Aerodyne Aerosol Chemical Speciation Monitor (ACSM) during February–March 2018. The average NR-PM mass concentration throughout the study was 58.0 ± 42.6 µg m −3 , where contribution of organic aerosol (OA) 69% total . In Delhi, chloride (10%) main inorganic contributor, followed by ammonium (8%), sulfate (7%), and nitrate (6%), contrasting prevalence most urban environments....
Online chemical characterization of NR-PM1 (nonrefractory particulate matter ≤1 μm) has been carried out using an ACSM (Aerosol Chemical Speciation Monitor) at a coastal urban site in Chennai, India. The average mass concentration during the campaign was 30.4 ± 28.3 μg/m3 (arithmetic mean standard deviation) with organics accounting for major fraction ∼47.4% followed by sulfate (∼33.3%). Back trajectory analysis and STILT model simulations enabled identification relatively clean period...
Abstract. The Multilinear Engine (ME-2) factorisation tool is being widely used following the recent development of Source Finder (SoFi) interphase at PSI. However, success this tool, when using a-value approach, largely depends on inputs (i.e. target profiles) applied as well experience user. A strategy to explore solution space proposed objectively determine that best deconvolves organic aerosol (OA) sources where trilinear regression has proven be a useful compare different ME-2...
Abstract. Atmospheric aerosol particles are known to have detrimental effects on human health and climate. Black carbon is an important constituent of atmospheric particulate matter (PM), emitted from incomplete combustion. Source apportionment BC very important, evaluate the influence different sources. The high-resolution soot particle mass spectrometer (HR-SP-AMS) instrument uses a laser vaporiser, which allows real-time detection characterisation refractory black (rBC) its internally...
Abstract The COVID lockdown presented an interesting opportunity to study the anthropogenic emissions from different sectors under relatively cleaner conditions in India. complex interplays of power production, industry, and transport could be dissected due significantly reduced influence latter two emission sources. Here, based on measurements cloud condensation nuclei (CCN) activity chemical composition atmospheric aerosols during lockdown, we report episodic event resulting distinct...
Abstract. Over the past decade, there has been an increasing interest in short-term events that negatively affect air quality such as bonfires and fireworks. High aerosol gas concentrations generated from public bonfires/fireworks were measured order to understand night-time chemical processes their atmospheric implications. Nitrate chemistry was observed during bonfire night with nitrogen containing compounds both phase further N2O5 ClNO2 concentrations, which depleted early next morning...
Spatial and temporal data of particulate matter (PM) are limited in Indonesia; hence cost-effective robust instruments to monitor PM concentration could complete coverage. The low-cost sensor (LCS) Alphasense OPC-N2 provides real-time is relatively simple install deploy. This paper presents from an collocated with a PM10 Beta Attenuation Monitor (BAM). study was carried out at air quality monitoring site North Jakarta belonging the provincial government. location considered suitable for...
In this paper, the characteristics of non-refractory aerosol using an International Civil Aviation Organization (ICAO) compliant sampling system emitted from two gas turbine relevant sources are reported, namely: in-service turboshaft helicopter engine and a development combustor rig. Positive Matrix Factorisation (PMF) analysis was applied on Aerosol Mass Spectrometer's (AMS) Unit Resolution (UMR) organic (OA) data to identify three chemical factors: one unburnt fuel factor (AlkOA; Alkane...
Abstract. The nature and origin of organic aerosol in the atmosphere remain unclear. gas–particle partitioning semi-volatile compounds (SVOCs) that constitute primary aerosols (POAs) multigenerational chemical aging SVOCs are particularly poorly understood. volatility basis set (VBS) approach, implemented air quality models such as WRF-Chem (Weather Research Forecasting model with Chemistry), can be a useful tool to describe emissions POA its evolution. However, evaluation uncertainty...
Abstract. Air pollution in urban environments has been shown to have a negative impact on air quality and human health, particularly megacities. Over recent decades, Delhi, India suffered high atmospheric pollution, with significant particulate matter (PM) concentrations as result of anthropogenic activities. Organic aerosols (OA) are composed thousands different chemical species one the main constituents submicron particles. However, quantitative knowledge OA composition, their sources...
Abstract. We present the first real-time composition of submicron particulate matter (PM1) in Old Delhi using high resolution aerosol mass spectrometry (HR-AMS). is one most polluted locations world, and PM1 concentrations reached ~ 600 µg m−3 during period, post-monsoon, where increased by 178 % over pre-monsoon period. Using positive matrix factorisation (PMF) to perform source apportionment analysis, two burning-related factors contribute (35 %) post-monsoon increase. The PMF factor,...