Carbon monoxide (CO) levels in a traffic corridor average 45 ppm during peak hours. a) Convert this concentration into \( \mathrm{mg} / \mathrm{m}^{3} \) at \( 26^{\circ} \mathrm{C} \) and 1.2 atm . b) Estimate the exposure dose for a pedestrian staying 3| hours in this environment. c) Propose control strategies such as signal optimization and fuel standards. d) Plot a time-variation graph of CO levels over a 12 -hour period with two peak intervals.
