Chemical weapon

Some weapons use bad air.

These can hurt people. They can make people very sick.

These weapons were used in big wars.

Many people were hurt by them. It was a very sad time.

Leaders saw this was wrong. They made rules to stop it. They wanted to keep people safe.

Many lands joined a big group.

This group helps stop these weapons. They work to destroy them.

Most countries now say these weapons are not allowed. People work hard to make the world better.

Chemical weapons use harmful chemicals to hurt or kill people.

These weapons do not use explosions. They use the bad effects of the chemicals instead. Some chemicals can sting the eyes or skin. Others can make it hard to breathe.

People have used these weapons for a long time. They were used in a big way during World War I. This caused many injuries and deaths.

During World War II, Nazi Germany used gas to kill many people. This was part of the Holocaust. This was the deadliest use of gas in history.

After the wars, many countries kept large stores of these weapons. This was part of the Cold War. In 1993, many nations signed a new rule. This rule is the Chemical Weapons Convention.

It says countries cannot make or use these weapons. A group called the OPCW helps make sure countries follow the rule. Many countries have worked to destroy their old stocks of chemicals.

Chemical weapons are special tools that use harmful substances to cause injury or death.

These weapons do not rely on explosions to work. Instead, they use the unique properties of chemicals to affect humans. Some chemicals are designed to be lethal, such as nerve agents like sarin or VX. Others are used to sting the eyes or skin, such as tear gases. These are often called weapons of mass destruction. They are grouped with nuclear and biological weapons in a category called NBC.

These weapons work by using toxic properties to achieve a goal. They can be delivered in many ways. Some are released from aircraft or rockets. Others come from remote-controlled containers. Some chemicals are unitary, meaning they are used as they are. Other weapons are binary. This means two different chemicals combine right where they are used. Some agents are very volatile and spread quickly. Others, like VX, are persistent and stay in an area for a long time.

History shows that people have used chemical tools since ancient times. However, they were first used on a large scale during World War I. Many nations used mustard gas, chlorine, and phosgene gas. These gases caused blindness, lung scarring, and death.

During World War II, Nazi Germany used a gas called Zyklon B. They used it in gas chambers during the Holocaust. This was the largest death toll from chemical weapons in history. The Empire of Japan also used mustard gas and lewisite during the Second Sino-Japanese War.

After the big wars, many countries kept large amounts of these weapons. During the Cold War, the Soviet Union and the United States had the largest stockpiles. They focused on chemicals like sarin and mustard for use in Europe. Later, chemical weapons were used in the Iran-Iraq War and the Syrian civil war. In 1993, the world created the Chemical Weapons Convention. This is a global rule that bans making, storing, and using these weapons. There are now 193 countries that follow this treaty. The United States finished destroying its own stockpile by 2023.

Today, the world works hard to prevent the use of these substances. An organization called the OPCW helps manage the rules of the convention. While most countries follow the rules, some nations like North Korea have not joined. Small amounts of chemicals are still allowed for research and defense. This helps people learn how to protect themselves. People can use special equipment and training to stay safe. Understanding this history helps us see why these rules are so important for peace.

A chemical weapon is a specialized munition that uses toxic chemicals to cause death, injury, or incapacitation.

According to the Organisation for the Prohibition of Chemical Weapons (OPCW), these weapons include any chemical compound or its precursor. They are designed to cause death, injury, or temporary incapacitation through chemical action. This definition also includes the delivery devices used to spread them. These devices can be filled or unfilled. Chemical weapons are classified as weapons of mass destruction. This group also includes nuclear, biological, and radiological weapons. Together, these are often called NBC warfare. Unlike conventional weapons, chemical weapons do not rely on explosive force. They depend entirely on the unique chemical properties of the agent used.

Chemical agents work through various biological and physical mechanisms. Lethal agents are categorized by how they affect the body. Nerve agents, such as tabun, sarin, soman, VX/VR, and Novichok, attack the nervous system. Blister agents, primarily mustard gas, cause severe skin and eye damage. There are also non-lethal agents, such as tear gases like CS gas or pepper spray. These are used for sensory irritation rather than death. Some agents are incapacitating, such as BZ. Chemicals can be unitary, meaning they are used in their pure form. Other weapons are binary. In binary weapons, two different precursors combine in situ, or on the spot, to create the active agent. Some chemicals are highly volatile and spread rapidly through the air. Others, such as VX, are persistent and remain in an environment for a long time.

The delivery of these substances can take many forms. Payloads can be released from aircraft or rockets. They can also be delivered via remote-controlled containers. The purpose of using these chemicals varies depending on the goal. A lethal agent might be used to kill an opposing force. It can also be used to deny an enemy the use of specific terrain. Defoliants are a type of chemical used to kill vegetation quickly. This removes cover and concealment from an area. Chemicals can even be used against agriculture and livestock to promote starvation.

The history of chemical warfare reaches back to antiquity. However, modern chemical warfare emerged in the 19th century. During World War I, major powers used these weapons on a massive scale. Nations employed mustard gas and choking agents like phosgene and chlorine. These gases caused lung scarring, blindness, and death. Military gas casualties in this era are estimated between 500,000 and 1.3 million people. During World War II, the Empire of Japan used mustard gas and lewisite in China. Nazi Germany also researched potent nerve agents during this time. However, they did not use these new nerve agents on the battlefield, likely fearing retaliation from the Allies.

Despite limited battlefield use in World War II, Nazi Germany used chemical agents for genocide. They used Zyklon B, a commercial hydrogen cyanide blood agent, in gas chambers. They also used carbon monoxide against various populations. The Holocaust resulted in the largest death toll from chemical weapons in history. In the post-war era, the Cold War saw massive stockpiling. The Soviet Union and the United States created the largest chemical weapon programs in history. They focused on sarin, VX/VR, and mustard gas for use in Europe. Later conflicts, such as the Iran-Iraq War and the Syrian civil war, saw repeated use of these weapons. In the Iran-Iraq War, approximately 100,000 Iranian troops became casualties of Iraqi chemical weapons.

International efforts to ban these weapons began long ago. The 1899 Hague Convention prohibited the use of poison and poisoned arms. The 1925 Geneva Protocol also prohibited chemical and biological weapons in international conflicts. However, these earlier treaties did not address the production or storage of chemicals. The 1993 Chemical Weapons Convention (CWC) changed this. The CWC is a legally binding treaty that outlaws the development, production, stockpiling, and use of chemical weapons. It is administered by the OPCW. Currently, 193 states are parties to this convention. The United States completed the destruction of its chemical arsenal by 2023.

While the treaty is widely followed, challenges remain. Some nations, such as Syria and Russia, are believed to have violated prohibitions on use and stockpiling. Israel and North Korea are not parties to the convention. Small research quantities are still permitted for CBRN defense purposes. This allows nations to develop proper protection, such as training and decontamination measures. Understanding these complex systems and historical patterns is essential for maintaining global security and preventing future harm.