For the 1-hour average value, a city reports 0.17 ppm ozone. the permissible limit is 0.12 ppm ozone. by what amount in ppm does the report value exceed the permissible limit? this exceeded amount is what percentage of the permissible level?

Diffraction is when light is bent around obstructions. which of the these observation about clouds would indicate diffraction? a) after rain storms, you can sometimes see rainbows. b) clouds are white or gray and cannot be seen through. c) on a cloudy day, the temperature tends to be cooler than a sunny day. d) the edges of dark clouds appear lighter. this