Surface Ozone & Air Quality Research

Reading the afternoon peak
in India's air.

I study how surface ozone and its precursors behave across Indian cities — from decade-long CAAQMS records to the machine-learning models that forecast them — and manage the national monitoring infrastructure that makes that data possible.

Mean Diurnal Surface O₃ — Delhi CAAQMS
Single-peak afternoon photochemistry
00:0008:0015:00 IST24:00
Priya Dwivedi
About

Ten years in the field, one question at the centre of it.

I am a Senior Executive (Environmentalist) at ENVEA India Pvt. Ltd. (Central Pollution Control Board CAAQMS Project), where I manage the operation and maintenance of CPCB's Continuous Ambient Air Quality Monitoring Stations (CAAQMS) across Delhi, Lucknow, Chennai and Bengaluru — part of the backbone of India's national air quality data infrastructure.

Alongside this, I am a sixth-year PhD scholar at CSIR-National Physical Laboratory, working under the supervision of Dr. Radhakrishnan S.R. My doctoral thesis — "Studies on the Variation of Ambient Ozone and its Precursors in Different Indian Environmental Conditions" — has been submitted and is currently under evaluation.

My work sits at the intersection of long-term monitoring, atmospheric chemistry, and applied machine learning — using over a decade of hourly CAAQMS observations to understand why ozone behaves differently from one city, one season, and even one year to the next.

Outside the lab: a district-level table tennis runner-up, and a Visharad (advanced diploma) in Kathak, Indian classical dance.

Based inNew Delhi, India
RoleSr. Executive (Environmentalist), ENVEA India Pvt. Ltd. (CPCB CAAQMS Project)
Doctoral workCSIR-National Physical Laboratory
SupervisorDr. Radhakrishnan S.R.
Experience~10 years, air quality monitoring & research
Expertise

Where the monitoring station meets the research question.

01

Ambient Air Quality Monitoring

O&M of national CAAQMS networks — calibration, QA/QC, and CPCB-compliant reporting across multi-city monitoring stations.

02

Ozone & Precursor Chemistry

Surface ozone, NOₓ and VOC dynamics; precursor-limited regimes; diurnal, seasonal and inter-annual variability.

03

Machine Learning for Air Quality

XGBoost and related forecasting models for station-wise ozone prediction, trained on decade-scale hourly observations.

04

Environmental Data & Metrology

Uncertainty assessment, instrument QA/QC, and data validation for regulatory-grade air quality datasets.

05

Regulatory Reporting

CPCB liaison, contract and compliance management, and technical reporting for government monitoring programmes.

06

Scientific Writing

Peer-reviewed publication, manuscript development, and translating monitoring data into policy-relevant findings.

Skills & Training

Tools of the trade.

Software & Tools

  • QGIS
  • MS Excel (Advanced)
  • MS Office & Teams

Sustainability & ESG

  • Certificate in ESG Reporting — The ESG Institute (2026)
  • Environmental compliance & regulatory reporting

Certifications & Trainings

  • Certified Internal Auditor — ISO/IEC 17025:2017 (BIS/NITS, 2024)
  • Stack Monitoring, Analysis & Reporting — IQAS Knowledge Centre (2026)
  • Winter School: Receptor Modelling & Sensor Applications for AQ Management — IIT Madras (2024)
  • Environmental Pollution Prediction using Computational Modelling — CSIR-IITR (2023)
Research

Selected findings.

A decade of Delhi CAAQMS data, read through ozone's precursors, its triggers, and the events that disrupt it.

2026

Seven-Year Trends in Ambient Air Quality and Ozone Dynamics in Delhi

A seven-year assessment of Delhi's air quality and ozone behaviour, drawing out lessons from the COVID-19 lockdown as a natural experiment and comparing observed trends against GAINS/ECLIPSE emission projections.

Seven-year trends COVID-19 natural experiment GAINS/ECLIPSE
2025

Diwali Firecracker Emissions and Air Quality in Delhi

An eight-year comparative study (2017–2024) quantifying the impact of Diwali firecracker emissions on Delhi's air quality, tracking how the pollution spike has evolved year over year.

Eight-year comparison Firecracker emissions Delhi air quality
2020–26

Doctoral Thesis — Ambient Ozone & Precursor Variability in Indian Environments

A decade-scale study (2014–2024) across ten CAAQMS stations, covering uncertainty in ozone measurement, diurnal and seasonal analysis in Delhi, and pan-India spatiotemporal patterns of ozone and its precursors.

CSIR-National Physical Laboratory Ten-station dataset 2014–2024
Education

Foundations.

Postgraduate

M.Sc. Environmental Science

University of Allahabad
Undergraduate

B.Sc.

University of Allahabad
Experience

Field work and research, side by side.

2020 — Present

PhD Scholar

CSIR-National Physical Laboratory, New Delhi

Doctoral research on ambient ozone and precursor variability across Indian environments, under the supervision of Dr. Radhakrishnan S.R. Thesis submitted and under evaluation.

2016 — Present

Senior Executive (Environmentalist)

ENVEA India Pvt. Ltd.

Operation & maintenance of CPCB CAAQMS stations across Delhi, Lucknow, Chennai and Bengaluru — calibration, data validation, regulatory reporting, and CPCB liaison for national air quality infrastructure.

Publications

Peer-reviewed work.

Seven-Year Trends in Ambient Air Quality and Ozone Dynamics in Delhi: COVID-19 Lockdown Lessons and Future Pathways from GAINS/ECLIPSE Projections International Journal of Environment and Climate Change, 16(2): 56–84 (2026) · doi.org/10.9734/ijecc/2026/v16i25267
Estimation of uncertainty of an ozone analyzer installed at an ambient air quality station in Delhi MAPAN — Journal of Metrology Society of India (2026) · doi.org/10.1007/s12647-026-00906-5
The impact assessment of Diwali firecracker emissions on air quality in Delhi, India: a comparative study of eight consecutive years (2017–2024) Journal of Atmospheric Chemistry (2025) · doi.org/10.1007/s10874-025-09474-5
Trends in Dust Pollution in Delhi (2011–2024): A Multi-Station Analysis Journal of Environment and Bio-Sciences (2025) · doi.org/10.59467/JEBS.2025.39.111
A Study on the Effect of Crop-Residue Burning (CRB) on Air Quality Over the Megacity Delhi During Winter Season Advances in Metrology: Select Proceedings of AdMet 2024, Springer LNME (2025) · doi.org/10.1007/978-981-96-6418-4_14
प्रदूषक पैटर्न: दिल्ली में वार्षिक वायु गुणवत्ता प्रवृत्तियाँ (Pollutant Patterns: Annual Air Quality Trends in Delhi) Samidha — Environment Special Issue, Vol. 43, CSIR-National Physical Laboratory, New Delhi (2022–2023)

Two further manuscripts are currently under review / major revision — see Research above.

Conferences & Recognition

Beyond the paper.

2025

Session Moderator, CCIE-2025

International Conference on Climate Change, Innovation & Environment, Kathmandu, Nepal.

2025

Best Poster Award — BioEnviroCon-2025

"Air Quality over the Megacity Delhi before, during and after COVID-19 Lockdown," IIT Delhi.

2025

Poster Presentation, CCIE-2025

"Air Quality Assessment and Variability in Indian Ecosystems," Kathmandu, Nepal.

2025

ICEPR-2025, Paris

15th International Conference on Environmental Pollution and Remediation, Paris, France.

Certified Internal Auditor — ISO/IEC 17025:2017 (Laboratory Quality Management).

Let's talk air quality, ozone, or data.

Open to research collaborations, postdoctoral opportunities, and conversations about India's air quality monitoring infrastructure.

Email Me →
Location
New Delhi, India
Google Scholar
Institution
CSIR-National Physical Laboratory