. >> supervisors, my name is francisco dacosta. this is the city and county of san francisco, which has many astute constituents. you know, supervisors, when it comes to our libraries or when it comes to our institutions, we need the public -- the public at home -- to know exactly what is happening. we have a library that is a landmark library, built by renowned architect. and not a word has been said. we bring our children, and our children listen to the adults. you could bring 5000 children and just have them put their hands up. they will. the other children. but we need to do is give our children the best. in all this talk and presentation, have we seen any empirical data, indoor and outdoor decks let me start with outdoor data from the environmental justice center. in this area, this will generate particulates. do we have any empirical data? no. indoors, it is true t