Tear gas is a chemical weapon that causes severe eye irritation, coughing, and difficulty breathing. It is commonly used by law enforcement to disperse crowds and control riots.

Tear gas works by activating the TRPA1 receptor, which is a pain receptor found in the eyes, nose, and throat. When TRPA1 is activated, it sends a signal to the brain that causes the release of histamine and other inflammatory chemicals. These chemicals cause the eyes to water and become red, the nose to run, and the throat to swell.

Tear gas can also cause nausea, vomiting, and diarrhea. In some cases, it can even lead to death.

How to Protect Yourself from Tear Gas

There are a few things you can do to protect yourself from tear gas:

* Wear goggles or a gas mask. This will help to keep tear gas out of your eyes.

* Hold a wet cloth over your face. This will help to absorb some of the tear gas.

* Move to a well-ventilated area. This will help to reduce your exposure to tear gas.

* Flush your eyes with water. If you get tear gas in your eyes, flush them with water for at least 15 minutes.

If you are exposed to tear gas, it is important to seek medical attention immediately. This is especially important if you have any respiratory problems.