Pedestrian Simulation and Aerosols: ROCHOR+

Walking is seen as a healthy mode of transportation. Research backs this up by showing that increasing physical activity the risk of cardio vascular diseases is reduced. But walking exposes people other risks like aerosols. This research measures the difference in exposure in different areas of ROCHOR+.


This allows us evaluate different paths if they are healthier for the people. In a second stage an agent-based simulation to see where people are walking and to find the subtle interventions to guide people along those paths. The agent simulation is augmented to use them as a sensor for pollutant and find healthier path combinations.


An agent-based simulation showed that with small interventions the people would walk not along the main roads but in the backlanes. The first hunch that the backlanes, far away from traffic, would be less polluted was not consistent. The area of Rochor has many restaurants that emit their exhaust directly on eye level into the backlanes increasing the aerosol concentration to hazardous levels. To improve the backlanes and convert them into a network of walking and cycling paths the exhausts have to be canalled in chimneys.


This will open up an area of more then 67’000 sqm commercially with an estimated value of more than 2.3 billion SGD stunting any cost involving building a chimney or improving the pedestrian comfort. In the long run it improves the health of the people by reducing their risk of pulmonary and cardiovascular diseases.




Simulated pedestrian movements in the existing configuration (left) and in an adjusted configuration (right); Aschwanden 2013


Acces to public transportation in Rochor; Aschwanden 2012