Panel: Environmental and Security Issues

Patrick DeLuca: An Effective Mitigation Strategy to Reduce Road Dust Near Industrial Sites in Hamilton, Ontario

Mark Ferguson: Movement of Dangerous Goods Across the Credit Valley Watershed

Charles Burke: Does Security Trump Travel?

Please leave your comments or questions for the panalists below. A live discussion will be held on Thursday, December 8 from 2:00-3:00PM. Click here to join the meeting room.

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3 Responses to Panel: Environmental and Security Issues

  1. Bill Anderson says:

    Patrick, great presentation. Especially since it provides statistical evidence of positive outcomes from a workshop initiative. My question relates to how you know what proportion of what you are measureing is from road dust. You have a diagram where you have a lot of spikes in PM10 measures, and if I understand correctly you are attributing them to road dust, because you might expect other sources to be more evenly distributed over space and time. How sure can you be that you are not picking up emissions from some industrial equipment that gets turned on and off or the passage of a gross emitting truck at the moment when the concentration is being measured? Would it be worthwhile to develop some sort of modelling approach to try to separate out sources in this type of data?

  2. Patrick DeLuca says:

    Hi Bill. Those are good questions. With respect to the graph, that is one day’s worth of monitoring. Typically what happens is that when there is a spike in values like that, we have repeatedly measured to ensure that it isn’t a fluke, so we may stay at a site longer, or we may come back repeatedly over a couple of days at different times. As we were monitoring, we kept detailed field notes so we would know if a gross emitting truck passed by, in those cases discarded the measurement. Likewise we know the wind direction and are aware of what is around us in terms of industry. Typically on the days that we were interested in measuring road dust, we had situations like what you see in the photos during the presentations, which is relatively large clouds of dust being resuspended as a vehicle travels over it.

    Yes, it would be worthwhile to develop a model to figure out the specific sources, we certainly recognize that we are also capturing anything else in the air at the same time, however, we do feel that most of what we were measuring was in fact road dust, particularly when our readings were in the 100 – 2000 ug/m^3.

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