Urban kits are a problem aren't they? They need to cover so many potential situations. I use a kit losely based on Lofty Wiseman's, but as I work in a number of large public buildings in the UKs second largest city I've been forced to consider a 911 type scenario. I now have a dust mask and goggles in my laptop bag. So, on balance I'd say at this moment in time there may be a need for them.