Dear Colleagues,

Air pollutants are produced by multiple sources of both anthropogenic and natural origin. Among these sources, the one that often receives media attention is the combustion of fuels in stationary and non-stationary systems.

According to the definition provided by United States Environmental Protection Agency (US EPA), Stationary Fuel Combustion Sources are devices that combust solid, liquid, or gaseous fuel, generally for the purposes of producing electricity, generating steam, or providing useful heat or energy for industrial, commercial, or institutional use, or reducing the volume of waste by removing combustible matter. Stationary fuel combustion sources also include systems for domestic use. In the last few decades, increasing attention has been paid to this kind of pollutant source and some government benefits have been used to promote the transition to more sustainable systems.

Non-stationary combustion systems producing air pollutants can be identified in the transport sector and off road. According to European Environment Agency (EEA), emissions of air pollutants have decreased for all transport modes since 1990, thanks to introduction of progressively stricter emissions standards and fuel quality standards. On the other side, for shipping and aviation this reduction is not evident. In particular, many concerns are related to nitrogen oxide emissions for ships while, for aviation, emissions of all pollutants have increased, except non-methane volatile organic compounds.

The aim of this Special Issue is to collect original and review articles on all aspects of research on “Gas Emissions from Combustion Sources” with the purpose of identifying the most relevant sources of air pollution and investigating new solutions for a cleaner environment.

The topics of this Special Issue include, but are not limited to:

• Emissions from internal combustion engines
• Emissions from stationary combustion systems
• Emissions from power generators
• Solutions for the optimization of combustion
• Solutions for the reductions of pollutants emissions from combustion sources
• Effects of COVID-19 and related lifestyle on gas emissions from combustion sources
• Spatial and temporal variations of emissions from combustion sources

Dr. Cinzia Tornatore
Dr. Andrea De Filippo
Guest Editors

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