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Related Experiment Video

Updated: Jul 4, 2026

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

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Published on: November 18, 2018

Intermediate-Volatility Organic Compounds in Two Chinese Megacities: Sources and Implications for Ozone Formation.

Guanqun Tang¹, Chudi Wang¹, Mingze Song¹

¹Shenzhen Key Laboratory of Organic Pollution Prevention and Control, School of Eco-Environment, Harbin Institute of Technology, Shenzhen 518055, China.

|July 3, 2026

Summary

This summary is machine-generated.

Intermediate-volatility organic compounds (IVOCs) are key ozone precursors. This study found higher IVOCs in Beijing than Shenzhen, with diverse sources like diesel and petrochemical emissions impacting urban air quality and ozone formation.

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Published on: June 14, 2018

Area of Science:

Atmospheric Chemistry
Environmental Science
Air Quality Research

Background:

Intermediate-volatility organic compounds (IVOCs) are significant precursors to ozone and secondary organic aerosol (SOA).
Urban characteristics and impacts of IVOCs are not fully understood.
IVOCs play a crucial role in atmospheric pollution in megacities.

Purpose of the Study:

To investigate the urban characteristics and sources of IVOCs in Shenzhen and Beijing.
To assess the contribution of IVOCs to ozone formation potential (OFP).
To inform air quality management and ozone mitigation strategies.

Main Methods:

Field investigation of IVOCs in Shenzhen and Beijing during summer 2024.
Source apportionment analysis for IVOCs.
Calculation of ozone formation potential (OFP) from IVOCs, including polycyclic aromatic hydrocarbons (PAHs).

Main Results:

Beijing showed significantly higher IVOCs concentrations (40.42 μg/m³) than Shenzhen (6.22 μg/m³).
Dominant IVOC sources differed: diesel emissions in Shenzhen (44.4%) and petrochemical industry in Beijing (35.5%).
IVOCs contributed substantially to OFP (32.9% in Shenzhen, 22.1% in Beijing), with PAHs being significant contributors.

Conclusions:

IVOCs have diverse sources and significant photochemical reactivity in different Chinese megacities.
IVOCs, especially PAHs, are non-negligible contributors to urban ozone formation.
Incorporating IVOCs into air quality management is essential for ozone mitigation in rapidly urbanizing regions.