Tuhin Kumar Mandal

Sashank Choudhary

Project Assistant-II
CSIR–National Physical Laboratory (CSIR–NPL), New Delhi
📅 March 2022 – September 2024
📍 New Delhi, India
📧 sashankchoudhary.10@gmail.com

🧪 Role in the South Asian Nitrogen Hub (SANH)

As a technical lead in the South Asian Nitrogen Hub (SANH) project at CSIR–NPL, Sashank Choudhary played a crucial field role in building one of the region’s most extensive ammonia monitoring networks.

As part of the SANH project—an international collaboration led by the UK Centre for Ecology & Hydrology—Sashank contributed significantly to atmospheric nitrogen monitoring across India, Bhutan, Nepal, Bangladesh, Sri Lanka, and the Maldives.

🔬 Key Technical Contributions

Environmental Instrumentation:
Installed, calibrated, and maintained DELTA samplers and electronic data acquisition systems at over 17 monitoring sites across South Asia.
Circuit Design & Troubleshooting:
Performed electronics circuit testing and real-time troubleshooting to ensure uninterrupted data capture and system uptime.
Data Analysis & Automation:
Used R and SQL to process air quality data; developed automated logging systems that improved operational efficiency and reduced errors.
Field Deployment & Team Training:
Led field logistics and trained junior engineers on calibration, instrumentation protocols, and safety procedures in remote deployments.
Networking & Communication Systems:
Supported telecommunication-based monitoring setups and configured field-to-lab network systems for continuous data transmission.

💡 Expertise At a Glance

Electronics & Instrumentation Design
Circuit Calibration, FPGA .
Software-Defined & Optical Instrumentation
Data Acquisition & Environmental Monitoring
Field Operations & Cross-Border Coordination
Research Collaboration & Technical Reporting

📘 Publication

Elemental Variation and Health Risk Assessment of PM₂.₅ in Delhi during the North-East and South-West Monsoon (Proceeding Paper)
(Contributed to instrumentation setup and data analysis)

Ummed Singh Saharan
Ph.D. Research Scholar
Academy of Scientific and Innovative Research (AcSIR) – CSIR–National Physical Laboratory (CSIR–NPL), New Delhi
📅 Year of Completion: 2024
📍 New Delhi, India

🧪 Research Focus – PM₂.₅ Exposure Assessment and Source-based Mortality in Delhi
As a doctoral researcher in the Faculty of Chemical Sciences at AcSIR–CSIR–NPL, Ummed Singh Saharan conducted an in-depth investigation into air pollution challenges in the National Capital Territory (NCT) of Delhi, with a focus on PM₂.₅ characterisation, source apportionment, and mortality impact assessment.

His work aimed to provide policymakers and scientists with actionable strategies for achieving clean air in Delhi NCR, addressing both local and transboundary pollution sources.

🔬 Key Research Contributions

Comprehensive PM₂.₅ Analysis:
Evaluated online and offline PM₂.₅ concentrations, performed chemical characterisation, and identified pollution sources using isotopes and receptor modelling.
Source Identification & Seasonal Trends:
Quantified contributions from mixed combustion, secondary aerosols, vehicular emissions, soil dust, industrial activity, and solid waste burning, highlighting seasonal patterns.
Transboundary Impact Assessment:
Used atmospheric chemistry transport models and ground data to assess cross-border contributions, particularly crop residue burning from Haryana and Punjab.
Long-term Air Quality Trends:
Analysed a decade (2010–2022) of air quality data, revealing significant PM₂.₅ reductions since 2017 due to policy interventions, but increasing episodic high-pollution days post-2020.
Clean Air Strategy Formulation:
Proposed NCAP-aligned and stricter reduction scenarios for PM₂.₅, detailing specific seasonal and sector-wise interventions for 2026 targets.

💡 Expertise At a Glance

Atmospheric Chemistry & Aerosol Science
Air Quality Monitoring & Source Apportionment
Isotopic Analysis & Receptor Modelling
Environmental Data Analysis & Trend Modelling
Air Quality Policy & Mitigation Strategy Design

📘 Thesis Title
“PM₂.₅ Exposure Assessment and Source-based Mortality over the National Capital Territory of Delhi”
Supervisor: Dr. T.K. Mandal | Co-Supervisor: Dr. Siddhartha Singh

Sashank Choudhary

Project Assistant-II CSIR–National Physical Laboratory (CSIR–NPL), New Delhi 📅 March 2022 – September 2024 📍 New Delhi, India 📧 sashankchoudhary.10@gmail.com

🧪 Role in the South Asian Nitrogen Hub (SANH)

As part of the SANH project—an international collaboration led by the UK Centre for Ecology & Hydrology—Sashank contributed significantly to atmospheric nitrogen monitoring across India, Bhutan, Nepal, Bangladesh, Sri Lanka, and the Maldives.

🔬 Key Technical Contributions

Environmental Instrumentation: Installed, calibrated, and maintained DELTA samplers and electronic data acquisition systems at over 17 monitoring sites across South Asia.

Circuit Design & Troubleshooting: Performed electronics circuit testing and real-time troubleshooting to ensure uninterrupted data capture and system uptime.

Data Analysis & Automation: Used R and SQL to process air quality data; developed automated logging systems that improved operational efficiency and reduced errors.

Field Deployment & Team Training: Led field logistics and trained junior engineers on calibration, instrumentation protocols, and safety procedures in remote deployments.

Networking & Communication Systems: Supported telecommunication-based monitoring setups and configured field-to-lab network systems for continuous data transmission.

💡 Expertise At a Glance

Electronics & Instrumentation Design

Circuit Calibration, FPGA .

Software-Defined & Optical Instrumentation

Data Acquisition & Environmental Monitoring

Field Operations & Cross-Border Coordination

Research Collaboration & Technical Reporting

📘 Publication

Elemental Variation and Health Risk Assessment of PM₂.₅ in Delhi during the North-East and South-West Monsoon (Proceeding Paper) (Contributed to instrumentation setup and data analysis)

Project Assistant-II
CSIR–National Physical Laboratory (CSIR–NPL), New Delhi
📅 March 2022 – September 2024
📍 New Delhi, India
📧 sashankchoudhary.10@gmail.com

Environmental Instrumentation:
Installed, calibrated, and maintained DELTA samplers and electronic data acquisition systems at over 17 monitoring sites across South Asia.

Circuit Design & Troubleshooting:
Performed electronics circuit testing and real-time troubleshooting to ensure uninterrupted data capture and system uptime.

Data Analysis & Automation:
Used R and SQL to process air quality data; developed automated logging systems that improved operational efficiency and reduced errors.

Field Deployment & Team Training:
Led field logistics and trained junior engineers on calibration, instrumentation protocols, and safety procedures in remote deployments.

Networking & Communication Systems:
Supported telecommunication-based monitoring setups and configured field-to-lab network systems for continuous data transmission.

Elemental Variation and Health Risk Assessment of PM₂.₅ in Delhi during the North-East and South-West Monsoon (Proceeding Paper)
(Contributed to instrumentation setup and data analysis)