Other emission models in Aimsun Next:
Aside from the LEM, there are two additional emissions models in Aimsun Next that can be used in microsimulation, the Panis et al Pollutant Emission Model and the QUARTET Pollutant Emission Model.
For Panis et al, the emissions for each pollutant are measured at each time step and considers the different factors according to vehicle type, fuel type and instant acceleration/deceleration measures. The model provides outputs for sections, nodes, turns and the replication for CO2, NOx, VOC and PM in g and g/km.
The QUARTET Pollutant Emissions Model requires more inputs from the user, particularly the emission rates for accelerating, decelerating and idling vehicles to name a few. These values are typically collected from an instrumented vehicle. The outputs from QUARTET are the kilograms of each pollutant emitted and are produced for the entire network, each section and turn and for each route.
More details can be found in the Environmental Models section of the Aimsun Next User Manual.
It is also possible to calculate emissions based on different models in a postprocess. For example, you can code a python script in Aimsun Next to calculate emissions from simulation outputs retrieved by a macroscopic simulation (i.e: based on the average speeds and flows for different vehicle types). You can also use Aimsun Next API to calculate any pollutant per any object for any time interval based on driving behavior parameters (acceleration, deceleration, delay time etc.).