There are advantages and disadvantages to using flow tubes (such as the PAM reactor) compared to environmental "smog" chambers. Advantages: - Wider range of oxidant exposure time (1–30 days vs. 1 day) - Shorter experiment duration (minutes vs. hours or days) Disadvantages: - High OH concentrations required to simulate atmospherical aging timescales (108 - 1010 vs. 106 - 107 molec cm-3) - High (parts-per-million) levels of O3 required for OH production - UV emission spectrum different than troposphere (peak λ = 254 nm vs λ > 300 nm) Under investigation: - Magnitude of wall effects/interactions on measurements

There are advantages and disadvantages to using flow tubes (such as the PAM reactor) compared to environmental "smog" chambers. Advantages: - Wider range of oxidant exposure time (1–30 days vs. 1 day) - Shorter experiment duration (minutes vs. hours or days) Disadvantages: - High OH concentrations required to simulate atmospherical aging timescales (108 - 1010 vs. 106 - 107 molec cm-3) - High (parts-per-million) levels of O3 required for OH production - UV emission spectrum different than troposphere (peak λ = 254 nm vs λ > 300 nm) Under investigation: - Magnitude of wall effects/interactions on measurements

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