Man-made disasters are caused by human actions including major accidents, deliberate or inadvertent actions of individuals or groups.

Potassium iodate can be used to protect the thyroid against the accumulation of radioactive iodine. It does this by saturating the body with a stable source of iodine prior to this exposure.

Poisonous gases are colorless and odorless, but their presence can be recognised through which we can save ourselves and our family too. These are now:
(i) The first symptoms of a possible chemical leakage are irritation, burning, and redness in the nostrils and eyes, followed by nausea, dizziness, and disorientation. Pungent or bitter-sweet smells indicate the presence of a gas in the air.
(ii) That panic induced fleeing during a gas leakage is harmful. Stay calm in the same place, put a wet cloth on your face and breath through it. Most gases will dissolve in water.
(iii) Lying down close to the ground may help since most hazardous gases are lighter than air and will tend to rise upwards.

One can recognise nuclear attack or accident through common symptoms of radioactivity which are nausea, dizziness, vomiting, and disorientation, with no odor but a wave of heat.
A nuclear explosion is followed by a 'blast' with thick gaseous cloud cover and can cause instant blindness if viewed.
So, if a nuclear accident or attack occurs do not panic just close all doors and windows at times of explosions, do not go outside but stay indoors till further communication from the government comes.
It is noteworthy that radioactivity does not penetrate solid structure, but fire can cause damage to buildings and human life.

Man-made disasters are considered more devastating than natural disasters, A vast level of human suffering, loss of life and long-term damage to a nation's economy and productive capacity are the cost of man-made disasters. There are various examples of this devastation such as:
• The Bhopal gas Tragedy, on 3rd December 1984, in Madhya Pradesh was an industrial accident in which 2500 people died and about 300,000 suffered from agonizing injuries from the disastrous effects of the massive poisoning.
• Another example of man-made disaster is a nuclear attack on two cities in Japan, Hiroshima and Nagasaki, on 6th August 1945 and 9th August 1945 respectively. In Hiroshima, 66,000 people were killed and 69,000 injured and in Nagasaki, 39,000 persons were killed and 25,000 injured.

Do's in the event of biological disasters:
(i) Follow regular hygienic methods as before eve!}' principal meal wash your hands with antibiotic soap.
(ii) Before cooking always wash vegetables properly. Follow active immunization.
(iii) If sickness occurs, immediately contact health authorities without any delay. In case of mosquitoes use nets or repellants at night.
Don'ts in the event of biological disasters:
(i) Do not panic and be calm.
(ii) Do not allow waste material to gather in or around your locality.
(iii) Do not allow stagnant water accumulated around you.
(iv) Do not eat stale food items.