Making a simple gas mask at home can be a temporary solution, but please note that these homemade masks do not provide the full protection of commercial-grade gas masks. Here is a basic method to make a simple gas mask, please use it only in emergencies: ### Materials: 1. **Plastic bottle** (2 liter or 1 liter) - as the mask body. 2. **Activated carbon** - as the filter material, which can be found in aquariums or online stores like. 3. **Cotton or gauze** - for filtering fine particles. 4. **Rubber bands or rope** - for fixing and tying the mask. 5. **Scissors and knife** - for cutting the bottle. 6. **Clean cotton mask or handkerchief** - to improve the seal. ### Steps: 1. **Prepare the plastic bottle**: - Carefully cut the bottom from the plastic bottle with a knife. Make sure the edges are smooth to avoid cuts. 2. **Make the filter**: - Place the activated carbon in the middle part of the plastic bottle. It is recommended to wrap the activated carbon with gauze to prevent it from falling apart. - Place a layer of cotton on either side of the activated carbon to filter larger particles from the air. 3. **Mask Body**: - Cut off the mouth of the bottle, making sure it is large enough to fit your nose and mouth. - Wrap the cutout of the mouth of the bottle with cotton mask to improve fit and comfort. 4. **Secure the Mask**: - Use rubber bands or ropes to pass through the holes on both sides of the mouth of the bottle to ensure it can be fixed on your head. 5. **Test and Adjust**: - Put on the mask and make sure it fits your face tightly. The length of the rubber bands or ropes can be adjusted to get a better seal. ### Notes: - Homemade gas masks may only be effective in very limited situations and cannot be used to deal with toxic gases, high concentrations of smoke or other severe air pollution. - Replace the activated carbon and wash the cotton cloth in time after use to ensure the filtering effect. - Wearing a commercial gas mask is a better choice when safety permits. This homemade method is only a temporary measure and is not guaranteed to be safe. In cases involving harmful chemicals, always give priority to professional equipment and seek professional help.