Smog ppt

Smog , Types of smog and smog 2020 in Pakistan

1. S MOG PRESENTED BY : Muzna Kashaf Roll number : 16261514-030

2. SMOG Smog is air pollution that reduces visibility. The term "smog" was first used in the early 1900s by H.A. Des Voeux to describe a mix of smoke and fog over many British towns. It is grimy, dirty, smelly and more dangerous than smoke. Smog was common in industrial areas, and remains a familiar sight in cities today.

3. FORMATION OF SMOG Pollutant from automobiles, factories etc. are released into the atmosphere. U nder certain conditions of the atmosphere these particles remain suspended in air. Suspended layer forms smog.

4. TYPES OF SMOG Two distinct types of smog are recognized: Sulfurous smog P hotochemical smog

5. SULFUROUS SMOG Also called as London or Industrial smog. It results from a high concentration of  sulfur oxides  in the air. It is caused by the use of sulfur-bearing  fossil fuels , particularly  coal . Under right conditions smoke and sulfur dioxide can combine with fog to produce industrial smog. In high conc. it is extremely toxic to humans and other living organisms.

6. PHOTOCHEMICAL SMOG It is also known as “Los Angeles smog”. It develops when primary pollutants (oxides of nitrogen and other organic compounds) interact under influence of sunlight (photochemical reaction). This interaction produces mixture of hazardous chemicals called secondary pollutants e.g. LA smog. Burning of fossil fuels like gasoline can also create photochemical smog.

7. EFFECTS OF SMOG Smog is unhealthy to humans and animals, and it can kill plants . It causes: Coughing and throat or chest irritation. Worsening of asthma symptoms. Difficulty in breathing and lung damage. Heart failure. Smog affects everyone differently, and some people are more susceptible to its negative effects. Children , seniors, and people with asthma need to be especially careful on smoggy days.

8. PRECAUTIONS To spend less time outdoors. S chedule your outside activities for the early morning or evening, when ozone levels are low . Drive less and walk , bike, carpool, and use public transportation whenever possible.

9. SMOG IN PAKISTAN In recent years, smog has become a problem for some cities in Pakistan due to industrial and transport pollution. The recent smog was observed on 6 th November in Lahore as AQI is recorded as 600. Punjab Minister for Industries, Commerce and Investment Mian Aslam Iqbal in november,2018 said the government was adopting adequate measures to combat pollution and smog across the province . He maintained that a campaign would be launched on social media to raise awareness about the damages caused to the environment by burning of solid waste.

10. THANKS.