[Characterization of photochemical smog chamber and initial experiments]

Area of Science:

• Atmospheric Chemistry
• Environmental Science
• Chemical Engineering

Context:

• Ozone and secondary organic aerosols are significant air pollutants with complex formation pathways.
• Accurate laboratory simulations are crucial for understanding atmospheric processes.
• Existing facilities may have limitations in characterizing these processes.

Purpose:

• To introduce and characterize a newly developed indoor environmental chamber facility.
• To assess the facility's performance in studying ozone and secondary organic aerosol formation.
• To validate the chamber's reliability through comparison with established atmospheric models.

Summary:

• Characterization experiments included measurements of wall effects for reactive species (O3, NO2) and determination of hydroxyl radical (*OH) sources via CO-NO(x) irradiation.
• Results indicate minimal wall effects for O3 and NO2 in the new reactor, while relative humidity significantly impacts wall losses in the older reactor.
• The facility demonstrated reliable performance in preliminary ethene-NO(x) and benzene-NO(x) experiments, showing good agreement with Model of Atmospheric Chemistry (MCM) simulations.

Impact:

• The validated chamber facility provides a reliable platform for in-depth studies of atmospheric chemical processes.
• This research contributes to a better understanding of air pollution formation, particularly ozone and secondary organic aerosols.
• The findings support the development of more effective strategies for air quality management and pollution control.