Diurnal Smog Variation

• Due to the time it takes for ozone to build up in the afternoon, the highest peaks of ozone occur inland, because the sea breeze transports pollutants inland during the afternoon.
• Without ROGs, the ozone concentration would remain low most of the day.
• At night, there is no sunlight to photo dissociate NO₂, so O₃ is not produced. The O₃ from the daytime photochemistry dissipates overnight.

Time series of ozone can be found at: http://www.atmos.ucla.edu/aqmd/currntobs.html for the LA Basin.