Question

In a city of area (8 km X8 km), the vehicular traffic is releasing 10^-5 g/m^2 -s of during the winter season between 4 pm and 8 pm. During this period mixing height is 100 m. The wind is blowing in the city at a speed of 4.0 m/s along the side of the city. If the initial concentration of CO at 4 pm was negligible, the estimated concentration of CO after 4 hours should be :
(1) 0.2 mg/m3
(2) 3.2 mg/m
(3) 2.0 mg/m3
(4) 20.0 mg/m3​

Answer 1

(2)=3.2mg\m

is correct answer