MEASUREMENT OF THE ATMOSPHERIC REACTIVITY OF EMISSIONS FROM GASOLINE AND ALTERNATIVE-FUELED VEHICLES: ASSESSMENT OF AVAILABLE METHODOLOGIES. PART 1. INDOOR SMOG CHAMBER STUDY OF REACTIVITY. PART 2. ASSESSMENT OF AIRTRAK AS A REACTIVITY ANALYZER. FINAL REPORT FOR THE SECOND YEAR, MARCH 1, 1994-FEBRUARY 28, 1995

During the second year of the GM smog chamber study of incremental reactivity the authors performed smog chamber experiments to measure three important properties of incremental reactivity. First, they challenged the linear relationship between the Carter factors and the chamber-measured reactivities found during the first-year smog chamber study. Second, they compared the predicted and measured smog formation in simple and complex mixtures. Third, they measured the incremental reactivities of three hydrocarbons (n-butane, propene, and p-xylene) as well as the urban-surrogate mixture at three different temperatures, 22 deg C, 32 deg C (the default), and 42 deg C, to determine how temperature affects both the absolute and the relative reactivity. Finally, they conducted experiments in which the incremental reactivity of NO2 was measured in order to test the Integrated Empirical Rate (IER) model.