As of the writing of this text, EPA standards limit atmospheric ozone levels in urban environments to 84ppb.

As of the writing of this text, EPA standards limit atmospheric ozone levels in urban environments to 84ppb.How many moles of ozone would there be in the air above Los Angeles County (area about 4000 square miles; consider a height of 10m above the ground) if ozone was at this concentration?Express your answer using two significant figures.nO3 = ? mol