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
Determine the Parts of sphygmomanometer Parts of sphygmomanometer consists of: - an inflatable cuff (wrapped around the arm when checking B.P) at vertical height as the hear

Give an example of each of the following types of proteins: a. Enzyme b. Structural protein c. Motor protein

Q. show the Symptoms of constipation? Have you ever suffered from constipation? Do you recall the symptoms associated with the problem? Yes, the symptoms were specific to havin

How does brain recognize difference between high and low c and soft and loud sounds?

The citric acid cycle, also called as the tricarboxylic acid (TCA) cycle or Krebs cycle (after its discoverer in the year of 1937), is used to oxidize the pyruvate making during th

What are the joints Joints are the place of articulation between two or more bones, or between a bone and a cartilage. Due to the presence of a number of joints, the movement

Which of the following serves as a signal for the ribosome to begin translating the transcript? A. Addition of the poly a tail to the 3' end of the transcript B. Deamination

What are the predicted cell morphology, cell arrangement and gram stain results for each of the follow? 1. Bacillus megaterium 2. Staphylococcus aureus 3. Serratia marcesc

State in brief about the Zinc    It is concerned with the functioning of sulphydryl compounds, such as cysteine, in regulation of redox potential within the cell. Zinc is somet

Q. Alcohol consumption by diabetes patient? Intake of alcohol should be limited. It is high in calories, lacks essential nutrients and may therefore promote ketoacidosis, hyper