Photochemical smog is a type of air pollution formed when sunlight interacts with nitrogen oxides and volatile organic compounds in the atmosphere. Nitrogen oxides come primarily from vehicle and truck exhaust while volatile organic compounds are emitted from products like paints, pesticides, and glues. This chemical reaction forms secondary pollutants like peroxyacetyl nitrate which can cause respiratory issues. Mexico City has high levels of photochemical smog due to vehicle emissions and geographic factors trapping pollution. Reducing vehicle use, industrial emissions, and VOC-emitting products can help lower smog levels and protect public health. The Great Smog of 1952 in London showed the deadly potential of severe smog, causing thousands of premature deaths.

1. PHOTOCHEMICAL SMOG

2. WE KNEW THAT :A smog is a mixture of Smoke + fog

3. If so,then what is a photochemical smog

4. Photochemical Smog is an air pollution ,formed when photons of sunlight hit molecules of different kinds of pollutants in the atmosphere

5. PEROXYACYTLYNITRATENITROGEN OXIDESVOLATILEORGANICCOMPOUNDPHOTOCHEMICAL SMOG

6. NITROGEN OXIDE mostly comes from the smoke of vehicles and Trucks ,contact of this with sunlight results in the smog formation

7. Volatile organic compounds (VOCs) are emitted as gases from certain solids or liquids. VOCs include a variety of chemicals, some of which may have short- and long-term adverse health effects. VOCs are emitted by a wide array of products numbering in the thousands. Examples : paints pesticides, building materials and furnishings, glues and adhesives etc

8. Peroxyacetyl Nitrate Definition(PAN):PANs are secondary pollutants, which means they are not directly emitted as exhaust from power plants or internal combustion engines, but they are formed from other pollutants by chemical reactions in the atmospherePOWER PLANTSINTERNAL COMBUSTION ENGINES

9. Health effects:It can cause anything from minor pain to deadly diseases such as lung cancer ,wheezing . Smog slowly ruins people's lungs to an extent as great as that of cigarettes.

10. Smog can irritate and inflame pulmonary membranes, causing chest pains, coughing, and throat irritation. Other illnesses such as colds and pneumonia can also be brought on by exposure to smog.People with asthma problems are under an even greater threat. Even minor exposure to smog may cause these people to get asthma attacks.Smog slowly ruins people's lungs to an extent as great as that of cigarettes.

11. AREA STUDY:Mexico is the highly polluted area due to theSevere contamination of the air by photochemical smog.Because of it geographical situation in form of a bowl,mexicosuffers more air from escaping and thereby rising the amount of gases from carsAnd trucks.“Mexico City's pollution is well-documented and notorious. Transport emissions from cars and trucks is mostly to blame. Ozone levels regularly exceed World Health Organization standards on approximately 300 days of the year. But fortunately public transportation initiatives like Metro bus system are offering a low-emissions alternative.” -Via Reuter/plantet ark

12. Air Quality Index:It help explain air pollution levels to the general public,8 hour average ozone concentrations of :

13. How to save environmentby preventing Smog???!!!

14. Promote prevention programs: “Smog Watch” is a pollution prevention program targeted Toward getting Individuals to reduce their smog-producing activities during summer hot spells. The goal of the Smog Watch program is to make sure we don't exceed the federal health standard for ozone. At the same time, we are safeguarding the health of our citizens.When weather conditions and air monitoring data indicate the probability of elevated smog levels in the next 48 hours, we will ask meteorologists, traffic reporters, news media, local businesses and other public agencies to encourage people to make voluntary changesto avoid further elevation of smog levels.

15. Try to use the vehicles at minimal level and check the engine’s smoke emission frequentlyPrevent high usage of coals,which result in heavy smogReduction of fumes from metal-working and other industrial plants;Buy green electricity-produced by low-or even zero-pollution facilities.Reduce pesticide use.vi. Consumers can reduce VOC emissions by avoiding paints with labels thatclearly indicate VOC limits are high. Switching to water-based paint is also useful.

16. What does it costs??!!

17. Total VOC emission:

18. Deadly incident:The Great Smog of '52or Big Smoke

19. The Great Smog of '52 or Big Smoke was a severe air pollutionevent that affectedlondon in December 1952. A period of cold weather, combined with an anti cyclone and windless conditions, collected airborne pollutants mostly from the use of coal to form a thick layer of smog over the city. It lasted from Friday 5 to Tuesday, 9 December, 1952, and then Quickly dispersed after a change in the weather.4,000 had died prematurely and 100,000 more were made ill because of the smog's effects

20. Lets start living and stop existingAnd save our mother earth

21. Thank you!!!By,K.SuganthiPrasanaIIIrd yr ECE