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Explain photo chemical smog theory?

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Smog : Smog is formed by the combination of SMoke + fOG .

Photo-chemical Smog : It is a Secondary type of smog wherein the pollutants formed due to the combustion of fossil fuels are directly released into the atmosphere by the Vehicles and Factories and these pollutants(chemicals like carbon monoxide , methane etc ) react with sunlight ( photo )  and the product thus formed is  toxic compounds which are hazardous to human race.
In order to form photocgemical smog there must some other chemical compund in atmosphere as well such as NITROUS OXIDE & OTHER VOLATILE ORGANIC COMPOUNDS (VOC's)
When nitrous oxide and VOCs interacts with sunlight , Secondary pollutants are formed such as OZONE and PEROXYACETYL NITRATE and these secondary pollutants play a vital role in photo-chemical smog.

Though OZONE is a boon to life on earth but its existence should be at high levels , if it reaches at the lower surface then ozone may cause many skin and lung diseases.
What are the dangers? 
Photochemical smog can have an effect on the environment, on people’s health and even on various materials. The main visible effect is the brown haze that can be seen above many cities. The brown tinge is caused by very small liquid and solid particles scattering the light. 
 Plants
Chemicals such as nitrogen oxides, ozone and peroxyacetyl nitrate (PAN) can have harmful effects on plants. These substances can reduce or even stop growth in plants by reducing photosynthesis. Ozone, even in small quantities, can achieve this, but PAN is even more toxic to plants than ozone. 





visharjun

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Smog : Smog is formed by the combination of SMoke + fOG .

Photo-chemical Smog : It is a Secondary type of smog wherein the pollutants formed due to the combustion of fossil fuels are directly released into the atmosphere by the Vehicles and Factories and these pollutants(chemicals like carbon monoxide , methane etc ) react with sunlight ( photo )  and the product thus formed is  toxic compounds which are hazardous to human race.
In order to form photocgemical smog there must some other chemical compund in atmosphere as well such as NITROUS OXIDE & OTHER VOLATILE ORGANIC COMPOUNDS (VOC's)
When nitrous oxide and VOCs interacts with sunlight , Secondary pollutants are formed such as OZONE and PEROXYACETYL NITRATE and these secondary pollutants play a vital role in photo-chemical smog.

Though OZONE is a boon to life on earth but its existence should be at high levels , if it reaches at the lower surface then ozone may cause many skin and lung diseases.
What are the dangers? 
Photochemical smog can have an effect on the environment, on people’s health and even on various materials. The main visible effect is the brown haze that can be seen above many cities. The brown tinge is caused by very small liquid and solid particles scattering the light. 
Plants
 Chemicals such as nitrogen oxides, ozone and peroxyacetyl nitrate (PAN) can have harmful effects on plants. These substances can reduce or even stop growth in plants by reducing photosynthesis. Ozone, even in small quantities, can achieve this, but PAN is even more toxic to plants than ozone. 



visharjun

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