a. What instantaneous release on the ground, in \(\mathrm{g}\), of acrolein will result in a downwind concentration \(1500 \mathrm{~m}\) immediately downwind on the ground equal to \(0.05 \mathrm{ppm}\) ? It is a bright sunny day with a wind speed of 3.5 \(\mathrm{m} / \mathrm{s}\). Assume rural conditions, a temperature of \(25^{\circ} \mathrm{C}\), and 1 atm pressure. Where does the maximum concentration occur on the ground for this release?

b. If the release is now \(10-\mathrm{m}\) above ground level, what is the concentration on the ground immediately downwind at \(1500 \mathrm{~m}\) ? Where does the maximum concentration occur on the ground for this case?