Smog: Difference Between Smog and Fog

Smog and fog are two atmospheric phenomena that often puzzle with their very similar appearance, despite their different characteristics, origin, and impacts on the environment and public health. In this blog, various aspects attached to the topic will be discussed.

What is Fog?

Fog is a natural weather-associated phenomenon characterized by tiny water droplets halted in the air near the ground. It comes into existence when the air temperature drops and reaches its dew points, resulting in water vapour condensing. Some of the key points about fog are discussed below:

Formation.

Fog mostly forms during the nighttime and also early in the morning when temperatures are cooler.

Appearance:

It can be seen as a thick cloud near the ground, obstructing visibility, but generally, it has no adverse impacts on health.

Types of Fog:

Fogs are different types, like Radiating fog, Advection fog, and Unslope fog, and each of them is formed in different circumstances.

What is Smog?

On the contrary, smog is a type of air pollution that forms with a combination of fog and smoke, or other pollutants. Its formation connects it to the urban area and industrial activities. The points discussed below will shed light on its different aspects.

Formation:

Smog is created when pollutants, such as sulphur dioxide, nitrogen oxides, and particulate matter, mix with moisture in the air, particularly in cooler temperatures.

Appearance:

It forms a thick haze, mostly brown or grey, crucially alleviating visibility and making adverse impacts on health issues.

Types of Smog:

There are two primary types of smog: 

Industrial smog,

Which is mainly caused by burning fossil fuels, and 

Photochemical

Smog occurs in sunny, warm climates due to the reaction of sunlight with pollutants.

Difference Between Smog and Fog

The difference between smog and fog can be summarized as follows:

Feature	Fog	Smog
Composition	Water droplets	Pollutants + water droplets
Formation	Cool temperatures	Pollutants + humidity
Visibility	Reduced visibility, but safe	Extremely reduced visibility
Health Impact	Minimal health risks	Serious health concerns
Occurrence	Common in cooler climates	Often in urban areas

Smog in Pakistan

During the past few years, smog in Pakistan has formed a significant environmental threat, especially in cities like Lahore and Karachi. The combination of industrial discharge, vehicle exhaust, and agricultural burn added to the worsening air quality. During winter, temperature inversions trap pollutants close to the ground, favouring severe smog episodes.

Health Effects:

Exposure to smog can cause respiratory issues, eye infections, and cardiovascular issues.

Economic Impact:

Smog also has adverse impacts on productivity, transportation, and overall quality of life.

Smog Prevention

Prevention of smog requires a multi-faceted approach:

Regulating Emissions:

Execution of strict laws on industrial emissions and vehicle exhaust can help reduce pollutants.

Promoting Public Transport:

Relying more on public transport should be encouraged, as it can serve to decrease the number of vehicles on the road, leading to lower emissions.

Awareness Campaigns:

 Counseling the public about the health impacts of smog and endorsing practices to minimize pollution can be beneficial too.

Conclusion

From the above discussed, one can understand that apparently similar-looking fog and smog are absolutely different. And with a better understanding, one can address various issues related to air quality, especially in regions like Pakistan where smog is known to be a crucial threat to public health and the environment. By following effective prevention policies, it is possible to reduce the impacts of smog and support a healthier environment.