Search research articles

ABOUT JoVE

Overview Leadership Blog JoVE Help Center

AUTHORS

Publishing Process Editorial Board Scope & Policies Peer Review FAQ Submit

LIBRARIANS

Testimonials Subscriptions Access Resources Library Advisory Board FAQ

RESEARCH

JoVE Journal Methods Collections JoVE Encyclopedia of Experiments Archive

EDUCATION

JoVE Core JoVE Business JoVE Science Education JoVE Lab Manual Faculty Resource Center Faculty Site

Terms & Conditions of Use

Related Concept Videos

Chronic Obstructive Pulmonary Disease-II: Pathophysiology

Chronic Obstructive Pulmonary Disease-II: Pathophysiology

Chronic Obstructive Pulmonary Disease (COPD) pathophysiology is intricate and multifaceted, involving a complex interplay of physiological processes. Understanding these mechanisms is crucial for effectively managing and treating COPD. Here is an in-depth look at the critical elements in the pathophysiology of COPD:
Chronic Inflammation

Global Climate Change

Global Climate Change

Throughout its ~4.5 billion year history, the Earth has experienced periods of warming and cooling. However, the current drastic increase in global temperatures is well outside of the Earth’s cyclic norms, and evidence for human-caused global climate change is compelling. Paleoclimatology, the study of ancient climate conditions, provides ample evidence for human-caused global climate change by comparing recent conditions with those in the past.

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by

Same author

Cross-Media Cycling of Tropospheric Reactive Nitrogen and Its Implications for Sulfur Chemistry.

Environmental science & technology·2026

Same author

Heterogeneous Photooxidation of Atmospheric Mercury Enhanced by Mixtures of Metallic Oxides and Sodium Chloride.

Environmental science & technology·2026

Same author

Heterogeneous Photochemical Reaction between H<sub>2</sub>O<sub>2</sub> and NO as a Potential Source of Daytime HONO in the Atmosphere.

Environmental science & technology·2026

Same author

pH-Dependent Photosensitized Generation of Multiphase •OH Radicals: Unravelling the Catalytic Mechanism.

Chemistry (Weinheim an der Bergstrasse, Germany)·2026

Same author

O<sub>2</sub>-Mediated Synergistic Oxidation of Aqueous Bisulfite and Nitrite: A Key Pathway for Sulfate and Nitrate Formation in Atmospheric Sulfur-Nitrogen Cycles.

Environmental science & technology·2026

Same author

Photolytic oxidation of ammonium chloride as a source of Cl<sub>2</sub> in the atmosphere.

Nature communications·2026

Search research articles

Related Experiment Video

Updated: Sep 27, 2025

Production and Measurement of Organic Particulate Matter in the Harvard Environmental Chamber

Production and Measurement of Organic Particulate Matter in the Harvard Environmental Chamber

Published on: November 18, 2018

Dramatic decrease of secondary organic aerosol formation potential in Beijing: Important contribution from reduction

Jun Liu¹, Biwu Chu², Yongcheng Jia¹

¹State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; University of Chinese Academy of Sciences, Beijing 100049, China.

The Science of the Total Environment

|April 10, 2022

Summary

Secondary organic aerosol formation potential (SOAFP) in Beijing dropped sharply by 74% between 2016 and 2017. This decline was primarily driven by reduced emissions from coal combustion due to the coal-to-gas transition.

Keywords:

Coal-to-gas Emission reduction SOA formation potential Twin-OFRs Urban area

More Related Videos

Split Point Analysis and Uncertainty Quantification of Thermal-Optical Organic/Elemental Carbon Measurements

Split Point Analysis and Uncertainty Quantification of Thermal-Optical Organic/Elemental Carbon Measurements

Published on: September 7, 2019

Reducing Willow Wood Fuel Emission by Low Temperature Microwave Assisted Hydrothermal Carbonization

Reducing Willow Wood Fuel Emission by Low Temperature Microwave Assisted Hydrothermal Carbonization

Published on: May 19, 2019

Related Experiment Videos

Last Updated: Sep 27, 2025

Production and Measurement of Organic Particulate Matter in the Harvard Environmental Chamber

Production and Measurement of Organic Particulate Matter in the Harvard Environmental Chamber

Published on: November 18, 2018

Split Point Analysis and Uncertainty Quantification of Thermal-Optical Organic/Elemental Carbon Measurements

Split Point Analysis and Uncertainty Quantification of Thermal-Optical Organic/Elemental Carbon Measurements

Published on: September 7, 2019

Reducing Willow Wood Fuel Emission by Low Temperature Microwave Assisted Hydrothermal Carbonization

Reducing Willow Wood Fuel Emission by Low Temperature Microwave Assisted Hydrothermal Carbonization

Published on: May 19, 2019

Area of Science:

Atmospheric Chemistry
Environmental Science
Air Pollution Research

Background:

Secondary organic aerosol (SOA) significantly contributes to urban PM2.5 pollution.
Understanding SOA formation potential (SOAFP) is crucial for identifying pollution sources.
Anthropogenic volatile organic compounds (VOCs) are key precursors to SOA.

Purpose of the Study:

To characterize the SOAFP of ambient air from anthropogenic VOCs in Beijing.
To investigate the factors influencing SOAFP changes between winters.
To assess the impact of emission reductions on SOAFP.

Main Methods:

Field observations using a twin oxidation flow reactor (Twin-OFRs) system.
Analysis of SOAFP, PM1, PM2.5, and CO concentrations.
Wind decomposition mathematical modeling to identify contributing factors.
Measurement of benzene to toluene ratios to infer emission sources.

Main Results:

Seasonal-average SOAFP decreased by 74% from 2016 to 2017.
This decline in SOAFP was greater than observed for PM1, PM2.5, and CO.
Reduced emissions from scattered coal combustion, a primary VOCs source, were identified as a key factor.
A significant decrease in the benzene to toluene ratio indicated reduced coal combustion emissions.

Conclusions:

Anthropogenic factors, particularly reduced coal combustion VOCs, and favorable meteorology significantly decreased SOAFP in Beijing.
The coal-to-gas transition played a crucial role in lowering VOC emissions and SOAFP.
The findings provide insights into SOAFP drivers and their contribution to PM2.5 in high-emission urban areas.