  Based on the empirical particulate emission model, we studied Particulate
Matter (PM) emission of some typical cellular automata VDR model and TT model
with slow-to-start rules under periodic condition and open boundary condition.
By simulations, it is found that the emission of the slow-to-start rule model
reaches the maximum emission at metastable state under periodic boundary
condition. Under open boundary condition, the phase diagram to reflect traffic
congestion is obtained. The injection probability and removal probability have
a great impact on PM emissions. Moreover, the effects of motion status on
emissions in the VDR model and TT model are studied under two different
boundary conditions. Numerical simulation shows that the PM emission of
decelerating traffic flow reaches the maximum in the congestion state under
periodic boundary condition. Under the open boundary conditions with the same
departure probability, the variation trend of particulate emission varies with
the state of different vehicle movements. For different removal probabilities,
the different maximum concentration of particulate matter is emitted even if
the vehicle is in the same motion state.
