smog - london smog and photochemical smog, Biology

The word 'smog' consists of two words 'smoke' and 'fog'. This name was given because Fog in the atmosphere Condense on the carbon particles of smoke to form smog. There are two types of smog.

London smog

         The smog formed sulphur oxides (SOx) particulates (soot, ammonium sulphate) and humidity is known as London smog. It is formed by following reactions.

                                 2SO2 + O2  2167_hydrocarbon.png   2SO3

                                                OR

                                 SO3 + H2O  2167_hydrocarbon.png  H2SO4        

In the atmosphere SO2 is oxidized into SO3 by many chemicals (NO, soot particle. SO3 combines with water and forms sulphuric acid droplets. These droplets condense on the carbon particles of soot. It is formed in the early morning hours of winter months. After sunrise it increases due to oxidation of SO2 to SO3 followed by dissolution in moisture.

It causes bronchial irritation, acid rain poor visibility.

los angles smog  (photo chemical smog)

It is oxidizing smog formed by action of sunlight on hydrocarbons and the nitrogen oxides. Hydrocarbons + NOx + sunlight  photochemical smog.

Photochemical smog is mixture of substances such as O3, PAN, NOx, aldehyde, ketone etc. it is formed by following reactions.

                                                                       In I.C. engines

                                             N2 (g) + O3 (g)    2167_hydrocarbon.png    2NO (g)

                                                                      Or furnaces                 

                              2NO (g) + O2 (g) 2167_hydrocarbon.png  2NO2 (g)

                                                    U.V light                      

                                    NO2 (g)    2167_hydrocarbon.png      NO (g) + (O)

                                             O2 (g) + (O)   2167_hydrocarbon.png   O3

                        Hydro carbons + O3 + O2 + O + NO + NO2     

Oxidized hydrocarbons (peroxides, peroxyacetyl nitrate (PAN), formaldehyde, aldehyde, acrolin etc.) these oxidized hydrocarbons and ozone in presence of humidity causes photo chemical smog. The photochemical smog dissipates at night. It causes irritation to eyes, nose and lungs, and may also damage the plants.

Posted Date: 7/12/2012 2:33:04 AM | Location : United States







Related Discussions:- smog - london smog and photochemical smog, Assignment Help, Ask Question on smog - london smog and photochemical smog, Get Answer, Expert's Help, smog - london smog and photochemical smog Discussions

Write discussion on smog - london smog and photochemical smog
Your posts are moderated
Related Questions
Explain the salient features biochemical origin of life.

Which is the cell organelle that is specialized in aerobic respiration? The cell organelles that are specialized in aerobic respiration are the mitochondria. Cell Respiratio

Which of the following processes help bring oxygen to the body cells that are in a leg? A. Net flux of oxygen from blood plasma into red blood cells in the body capillaries in

What are some diseases characterized by progressive loss of the axonal myelin sheath? Multiple sclerosis is a severe disease caused by progressive destruction of the myelin she

Iodine  deficiency Iodine is an important component of thyroid hormones, which play active role in several physiological process such as control of basal metabolic rate, oxidat

Define about the Zinc Deficiency? Evidence suggests that nearly one-third of preschool children in lower-income countries have stunted growth, and that a considerable proportio

Explain about the Derived Proteins? These are not naturally taking place proteins and are obtained from simple proteins by the action of enzymes and chemical agents, heat, mech

Classify bones structurally and embryologically(developmentally). Structural classification of bone: Macroscopically can be classified into two types, compact and trabecul

Coronary Arteries The right coronary artery originates form the right aortic valvular cusp, its, SA nodal branch supplies the SA node and AV nodal branch supply the AV nod

What is nidation? In which phase of the menstrual cycle does nidation occur? Nidation is the implantantion of the embryo in the uterus. Nidation happens around the 7th day afte