[Hugh R]

I guess if you want to make an argument about having zero diesel particulate in the air, like RWebb seems to be advocating, then you should look at ALL diesel exhaust. To its credit, the AQMD has cleaned up the LA Harbor local diesel exhaust air concentration a lot. Randy and I can disagree, but its a risk based assessment. Testing monthly for 30 minutes versus getting rid of Red Cross emergency sites because of no backup electrical power, that is the question. The AQMD has de facto said they'd rather that this school district NOT be able to help the sick, or wounded in an earthquake [yes we get them here, some times bad like the Sylmar and Northridge Earthquakes] which left 10's of thousands without running water, electricity, sanitation, natural gas, nothing.

Would you rather have NO emergency water supply, or the water in your swimming pool which may well have too much Total Dissolved Solids to meet EPA drinking water criteria? And the EPA saying you can't drink that water because it might be bad for you, so die of thirst.