"This Clean Air Research Program (CARP) presents an account of 39 smog chamber experiments performed using toluene and m-xylene vapour. These experiments included a reactive organic carbon (ROC) matrix study comprising ROC/NOx regime/threshold experiments at three NOx concentrations of ~69, ~50, and 34 ppbv and four hydrocarbon concentrations of 89, 63, 34 and 13 ppbv." (Quoted from paper)