Question

Draw a diagram to illustrate the typical concentration-time profiles observed for hydrocarbons, nitrogen oxides and ozone in a photochemical (summer) smog pollution episode.

Answer 1

PHOTOCHEMICAL SMOG- It is a type of smog formed by the reaction of uv light of sun and nitrogen oxides of atmosphere. It looks like a bronze hazae. It is most prominent during the morning and afternoon in dense polluted cities like LOS ANGELES, SYDNEY, MEXICO CITY etc.

COMPOSITION-  Nitrogen Oxide, Nitrogen Di Oxide, Ozone, Hydrocarbons, Nitric Acid, Aldehydes, Peroxyacyl Nitrates (PANs) and other secondary pollutants.
measurments after 24.hu - & Hydrocarbons composition - imadiation ? (NMHC) Avg. Hydrocarbon composition (NMHC) | INMHC) I final (mole % (ppmc) (ppm-molar) (ppm-molar Paraffin Olefin | Aromatic. 0.285 0.021 76 14 - 2.7 0.559 0.073 | 75 14 5.1 1125 0-177 72 1.4 4 • * Ozone vs time for various (NOx) .2.7 ppmC NMHC. 0.102ppm 0.183ppm 2.7ppmC NMHCI 40.276 ppm. wust (üedd) 80 0.052ppm V .0.435ppin. 0 0.015 ppm 2 4 6 8 10 12 14 16 18 20 22 Irradiation time (hr) y