Smog is a major problem in most developing and developed nations. Smog's primary causes are industrial and automobile emissions, wood and coal combustion, as well as the accumulation of specific weather conditions. Smog irritates our airways when we breathe it in, raising our chance of developing serious lung and heart conditions. Many cities monitor pollution levels because of these health dangers. This article will explain to you the Effects of Smog which will be helpful in Environment Subject preparation for the UPSC Civil Service Exam.

Effects of Smog

What is Smog?

• Dr H A Des Voeux coined the term "smog" in 1905.
• Smog was created by combining the words fog and smoke. Smog is a type of fog that contains soot or smoke.
• Smog is a type of air pollution that makes it difficult to see. Smog means smoke and fog that refers to smoky fog due to its opacity and odour.
• The term was originally intended to relate to pea soup fog, which was a common and major phenomenon in London from the 19th century to the mid-20th century.
• Nitrogen oxides, sulphur oxides, ozone, smoke, and other particles make up this type of visual air pollution.
• Coal combustion emissions, automotive emissions, industrial emissions, forest and agricultural fires, and photochemical reactions of these emissions all contribute to man-made events.
• The reaction of pollutants from automobiles, factories, and industries with sunlight and the environment causes smog.

Effects of Smog

Human Health

Coughing, allergies and eye problems

• High ozone levels can irritate the respiratory system, causing coughing and wheezing.
• They can also cause allergies and irritation of the eyes, chest, nose, and throat.
• When exposed, these effects often only last a few days, but even after the irritations subside, the smog's particles can still harm the lungs.
• Smog makes asthma symptoms significantly worse and can even cause asthma attacks.
• Some lung problems associated with smog's impacts include bronchitis, pneumonia, and emphysema because smog harms the lining of the lungs.

Premature death and Cancer

• According to a previous WHO assessment, smog exposure increases the risk of developing cancer and developing respiratory disorders, which can lead to early mortality.
• The inhalation of smog particles is responsible for thousands of preventable deaths in the United States, Europe, and Asia.
• These chemical particles include butadiene, benzene, and formaldehyde, which are all lung cancer-causing carcinogens.

Birth defects and stunting in children

• Birth abnormalities and low birth weight are strongly associated with smog.
• Babies born to pregnant women who were exposed to pollution experienced birth abnormalities.
• Birth defects linked to smog exposure include anencephaly, in which only part of the brain is present or underdeveloped, and spina bifida, which causes deformities of the spinal column.
• An extremely low birth weight at delivery may occur even with exposure to smog particulate matter as low as 5 g.

Rickets development​

• As UV rays cannot reach the earth's surface when there is persistently heavy pollution, there is inadequate bone marrow metabolism of calcium and phosphorus.
• This results in low levels of vitamin D production, which causes rickets.

Environment

• Plants and animal life are negatively impacted by the collection of chemicals contained in photochemical haze.
• Photochemical pollution can completely destroy these delicate crops, trees, and other vegetation because some plants, including tobacco, tomato, and spinach, are especially vulnerable to ozone.
• On the upper surfaces of tree leaves, ozone creates necrotic (dead) patterns.
• The development and production of trees can also be hampered by ground-level ozone.
• Smog has similar effects on animals as it does on people, including a reduction in lung function and elasticity.

Conclusion

Smog consists of hazardous air pollutants which cause severe damage to humans when inhaled and has the potential to kill plants. Emphysema, asthma, chronic bronchitis, lung infections, and cancer are just a few of the conditions that pollution can either induce or make worse. Smog is common in large cities with a high concentration of industry and traffic.

FAQs

MCQs

1. What is the primary cause of smog formation?

A) Emissions from vehicles
B) Agricultural activities
C) Industrial pollution
D) All of the above

2. Which of the following is a major health impact of smog exposure?

A) Liver damage
B) Respiratory issues
C) Weight gain
D) Blood pressure reduction

3. What weather condition contributes to the formation of smog?

A) Heavy rainfall
B) Low winds and temperature inversion
C) Thunderstorms
D) Warm winds

4. What is one major environmental impact of smog?

A) Depletion of the ozone layer
B) Increased rainfall
C) Decreased temperatures
D) Enhanced photosynthesis in plants

5. Which of the following is a measure to reduce smog levels?

A) Increasing fossil fuel usage
B) Enhancing public transportation
C) Promoting burning of crop residue
D) Increasing industrial emissions

GS Mains Questions and Model Answers

Q1: How does smog affect public health, and what strategies can be implemented to mitigate its effects?

Answer: Smog significantly impacts public health, particularly by causing respiratory issues such as asthma, bronchitis, and exacerbating cardiovascular diseases. Long-term exposure can also increase the risk of lung cancer. Vulnerable populations, including children, the elderly, and people with pre-existing health conditions, are at a higher risk. To mitigate its effects, strategies include improving air quality through regulations that limit emissions from vehicles and industries, promoting the use of clean energy sources, and encouraging public awareness campaigns to reduce behaviors that contribute to air pollution. Governments should also invest in green spaces to help absorb pollutants and establish air quality monitoring systems to inform the public about health risks.

Q2: Discuss the causes and consequences of smog formation, with particular emphasis on its environmental impact.

Answer: Smog is primarily caused by the reaction of pollutants, such as nitrogen oxides and volatile organic compounds, with sunlight. These pollutants are released from sources like vehicles, industries, and agricultural activities. Weather conditions such as low winds and temperature inversions contribute to the accumulation of pollutants, leading to smog. The environmental consequences of smog are severe, including the reduction of visibility, damage to vegetation, and the contribution to acid rain. Smog also contributes to the depletion of the ozone layer, which protects life on Earth from harmful ultraviolet radiation. The combined effects of these environmental impacts make smog a serious threat to both human health and the environment.

Q3: What steps can the government take to reduce the harmful effects of smog on both human health and the environment?

Answer: To reduce the harmful effects of smog, the government can take several steps. These include implementing stricter emissions standards for vehicles and industries, encouraging the use of cleaner fuels, and promoting public transport to reduce traffic emissions. Additionally, the government can invest in renewable energy sources to reduce dependence on fossil fuels, which are major contributors to smog formation. Public awareness campaigns are also crucial to educate people about the health risks associated with smog and the importance of reducing pollution. Lastly, governments can adopt policies for better urban planning, such as increasing green spaces and improving waste management systems, to combat the environmental effects of smog.

Previous Year Questions on Environmental Issues

1. UPSC CSE Mains 2020 (GS Paper 3):

Question: "Discuss the effects of air pollution on human health and the environment, and suggest measures to reduce it."

Answer: Air pollution, including smog, has a severe impact on human health, causing respiratory problems, cardiovascular diseases, and other chronic conditions. It also reduces life expectancy and increases healthcare costs. For the environment, air pollution leads to reduced visibility, damage to ecosystems, and contributes to climate change. Measures to reduce air pollution include promoting cleaner technologies, enforcing stricter emissions standards for industries and vehicles, increasing the use of renewable energy, and improving urban planning to reduce congestion and emissions. Public awareness campaigns and incentives for adopting cleaner technologies can further support efforts to combat air pollution.

2. UPSC CSE Mains 2021 (GS Paper 3):

Question: "Evaluate the role of government policies in mitigating the harmful effects of smog and improving air quality."

Answer: Government policies play a critical role in mitigating the harmful effects of smog and improving air quality. Measures such as enforcing emissions standards, promoting clean technologies, and providing incentives for electric vehicles have a direct impact on reducing smog. The government can also implement pollution control measures for industrial sectors and encourage the use of sustainable farming practices to reduce the burning of crop residues. Additionally, policies focusing on increasing green spaces, implementing air quality monitoring systems, and conducting public awareness campaigns can further support efforts to improve air quality and reduce the health impacts of smog.