CBRN event in India on Sat 25th July 2026

In Delhi, during a recent protest at Jantar Mantar, police fired tear gas shells to disperse the crowd. Following this, people present there experienced problems like burning eyes, coughing, and difficulty breathing. Tear gas is often used to control crowds during protests. In such a situation, it is very important to know how it affects our body. Tear gas is not ordinary smoke or gas, but a mixture of chemical particles that rapidly affects the eyes, skin, and respiratory system. Therefore, today, we will talk about the health risks of tear gas. We will also know that- Expert- Dr. Arvind Agarwal, Director, Internal Medicine, Sri Balaji Action Medical Institute, Delhi Dr. Padma Singh, Retired Lecturer, Chemistry, Prayagraj What is tear gas? Tear gas is a mixture of very fine chemical particles. It is released into the air through shells, grenades, or sprays. Upon contact, it causes severe burning in the eyes, tearing, coughing, difficulty breathing, and skin irritation. It is used to control crowds. Which chemicals are present in tear gas? Different types of chemical agents are used in tear gas. The most common among them is CS gas. See all major agents in the graphic- How does tear gas enter the body? Its very fine chemical particles enter the nose and lungs with breathing. These particles also come into direct contact with the eyes and skin. This causes irritation, tears, coughing, and difficulty breathing within seconds. How long does it take for its effect to start and how long does it last? Usually, its effect starts within 20-30 seconds. In most cases, the effect subsides within 15-30 minutes with fresh air. In some cases, prolonged exposure can cause discomfort for several hours or even a few days. What are the effects of tear gas exposure on the body? Tear gas primarily affects the eyes, respiratory system, and skin. The effects can be severe with prolonged exposure to the gas or if there is a pre-existing health condition. See all health risks in the graphic- How does tear gas affect the eyes, nose, and lungs? Understand it with these pointers- Can excessive exposure also lead to death? This is very rare. However, prolonged exposure to tear gas can lead to respiratory failure. This increases the risk of death. This risk is higher in people suffering from asthma, lung, or heart diseases. Who is at the highest risk? Tear gas affects everyone, but some people are at higher risk. See the graphic - What should you do for protection if you are near tear gas? In such a situation, first immediately move away from there to an open and fresh air area. What mistakes should you absolutely avoid if you are exposed to tear gas? Some mistakes when exposed to tear gas can increase health risks. See them in the graphic- What precautions should be taken if you wear contact lenses? Understand it with these pointers- In what situation is it necessary to see a doctor? Contact a doctor immediately in these situations- Keep in mind, people suffering from asthma, lung, or heart diseases should consult a doctor even if they have mild symptoms. What is the effect if tear gas is expired? The effect of expired tear gas is uncertain. Generally, its effectiveness may decrease over time. However, its use can cause irritation to the eyes, skin, and respiratory system. If the canister is damaged or the chemicals inside begin to break down, the risk may even increase. Therefore, the use of expired tear gas is not considered safe.