Photochemical smog


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Photochemical smog

  2. 2. WE KNEW THAT :<br />A smog is a mixture <br />of Smoke + fog<br />
  3. 3. If so,then what is a<br /> photochemical smog<br />
  4. 4. Photochemical Smog is an air <br />pollution ,formed when photons of<br /> sunlight hit molecules of different<br /> kinds of pollutants in the <br />atmosphere<br />
  6. 6. NITROGEN OXIDE mostly comes <br />from the smoke of vehicles and <br /> Trucks ,contact <br /> of this with <br /> sunlight results<br /> in the smog <br /> formation<br />
  7. 7. Volatile organic compounds (VOCs) are emitted as gases from <br />certain solids or liquids. VOCs include a variety of chemicals, <br />some of which may have short- and long-term adverse health <br /> effects. VOCs are emitted by <br /> a wide array of products <br /> numbering in the thousands. <br /> Examples : <br />paints pesticides, <br /> building materials and <br /> furnishings, glues and <br /> adhesives etc<br />
  8. 8. Peroxyacetyl Nitrate Definition(PAN):PANs are <br />secondary pollutants, which means they are not directly <br />emitted as exhaust from power plants or internal combustion <br />engines, but they are formed from other pollutants by chemical <br />reactions in the atmosphere<br />POWER PLANTS<br />INTERNAL COMBUSTION ENGINES<br />
  9. 9. Health effects:<br />It can cause anything from minor pain to deadly diseases <br />such as lung cancer ,wheezing . Smog slowly ruins people's <br />lungs to an extent as great as that of cigarettes.<br />
  10. 10. Smog can irritate and inflame pulmonary membranes, <br />causing chest pains, coughing, and throat irritation.  <br />Other illnesses such as colds and pneumonia <br />can also be brought on by exposure to smog.<br />People with asthma problems are under <br />an even greater threat.  Even minor <br />exposure to smog may cause these people<br /> to get asthma attacks.<br />Smog slowly ruins people's lungs to an <br />extent as great as that of cigarettes.<br />
  11. 11. AREA STUDY:<br />Mexico is the highly polluted area due to the<br />Severe contamination of the air by photochemical <br />smog.Because of it geographical situation in form of a bowl,mexico<br />suffers more air from escaping and thereby rising the amount of gases from cars<br />And trucks.<br />“Mexico City's pollution is well-documented and notorious. <br /> Transport emissions from cars and trucks is mostly to blame.<br /> Ozone levels regularly exceed World Health Organization standards <br /> on approximately 300 days of the year. But fortunately public <br /> transportation initiatives like Metro bus system are offering a<br /> low-emissions alternative.”<br /> -Via Reuter/plantet ark<br />
  12. 12. Air Quality Index:<br />It help explain air<br /> pollution levels to the<br /> general public,<br />8 hour average ozone <br />concentrations of :<br />
  13. 13. How to save <br />environment<br />by preventing <br />Smog???!!!<br />
  14. 14. Promote prevention programs:<br /> “Smog Watch” is a pollution prevention program targeted <br />Toward getting Individuals to reduce their smog-producing <br />activities during summer hot spells. The goal of the Smog Watch <br />program is to make sure we don't exceed the federal health <br />standard for ozone. At the same time, we are safeguarding the <br />health of our citizens.When weather conditions and air monitoring<br /> data indicate the probability of elevated smog levels in the next 48<br /> hours, we will ask meteorologists, traffic reporters, news media, <br />local businesses and other public agencies to encourage people to<br /> make voluntary changesto avoid further elevation of smog levels. <br />
  15. 15. Try to use the vehicles at minimal level and check the engine’s smoke emission<br /> frequently<br />Prevent high usage of coals,which result in heavy smog<br />Reduction of fumes from metal-working and other industrial plants;<br />Buy green electricity-produced by low-or even zero-pollution facilities.<br />Reduce pesticide use.<br />vi. Consumers can reduce VOC emissions by avoiding paints with<br /> labels thatclearly indicate VOC limits are high. Switching to <br /> water-based paint is also useful.<br />
  16. 16. What does it costs??!!<br />
  17. 17. Total VOC emission:<br />
  18. 18. Deadly incident:<br />The Great Smog of '52<br />or Big Smoke<br />
  19. 19. The Great Smog of '52 or Big Smoke was a severe air pollutionevent that affected<br />london in December 1952. A period of cold weather, combined with an anti cyclone<br /> and windless conditions, collected airborne pollutants mostly from the use of coal to <br />form a thick layer of smog over the city. It lasted from Friday 5 to Tuesday, 9 <br />December, 1952, and then Quickly dispersed after a change in the weather.<br />4,000 had died prematurely and 100,000 more were made ill because of the <br />smog's effects<br />
  20. 20. Lets start living and stop <br />existing<br />And save our <br />mother earth <br />
  21. 21. Thank you!!!<br />By,<br />K.SuganthiPrasana<br />IIIrd yr ECE<br />