The CLEERS Coordinating Committee periodically works with CLEERS participants to develop and distribute experimental protocols for use by the CLEERS community. These protocols are focused on generating data sets optimized for use in calibration and validation of emissions control device models. Historically, the CLEERS protocols have been aimed at laboratory synthetic exhaust gas flow reactor systems, though there is nothing precluding the development of protocols for engine dynamometer or vehicle experiments. Links to prior CLEERS protocols are included below. If you have questions or comments about these protocols, or have suggestions for other protocols that would be useful for the CLEERS community, please contact us.