Evaluate the correct solution of the following question

Question- Community benzene exposure has been a problem for a number of years downwind of a large aluminum smelter. The smelter emits ~29,000 lbs of benzene per year. You have been asked to evaluate the risk of community members living near the facility. After evaluating the wind pattern data for the area, you find that the wind blows the contaminant (benzene) over the community only 50% of the time. During the 50% of the time the wind is blowing benzene over the community and the average benzene concentration in the community is 13 µg/m³, the rest of the time the benzene concentration is below the detection limit of 0.1 µg/m³. Using the EPA default assumptions and a cancer slope or cancer potency factor of 2.9×10^-2 (mg/kg-d)^-1.

Part 1- Calculate the lifetime average daily dose and the risk from exposure to the benzene released by the Aluminum smelter.

I want help to find the risk from exposure to the benzene released by Aluminum.