Fire and smoke are responsible for the largest percentage of crash fatalities. The smoke in an airplane fire can be very thick and highly toxic, so cover your nose and mouth with a cloth to avoid breathing it in. If possible, moisten the cloth to provide extra protection. Stay low as you escape, to duck under the level of smoke. It might not seem like a big deal, but passing out due to smoke inhalation is one of the most dangerous things that can happen during this critical period. According to the National Transportation Safety Board (NTSB), 68 percent of plane crash deaths are due to post-crash fire, not injuries sustained in the crash itself. It’s critical to get out of the aircraft without delay. If fire or smoke is present, you will generally have less than two minutes to safely exit the plane. Make sure the exit you choose is safe. Look through the window to determine if there is fire or some other hazard outside of an exit. If there is, try the exit across the plane, or proceed to another set of exits. Flight attendants undergo rigorous training to make sure they know what to do in the event of a crash. If a flight attendant is able to instruct or assist you, listen closely and cooperate to increase everyone’s chances of survival. Don’t try to rescue your belongings. It’s common sense, but still some people don’t seem to get it. Leave everything behind. Rescuing your belongings will only slow you down. If you end up needing to salvage supplies from the plane crash site, worry about that later. Right now, you need to make sure that you get clear of the wreckage and find some safe cover. Get out now. If you’re stranded in a remote area, the best thing to do usually is to stay close to the aircraft to await rescuers. You don’t want to be too close, though. Fire or explosion can happen at any time after a crash, so put some distance between you and the plane. If the crash is in open-water, swim as far away from the plane wreckage as possible. While it’s essential to stay calm after a crash, you also need to recognize when you need to act and do so swiftly. Help out people who are struggling and tend to people's wounds using basic first aid available.  Attend to your own wounds if at all possible. Check yourself for cuts and other abrasions, and apply pressure if necessary. Stay in one place to reduce the chance of exacerbating internal injuries. Negative panic is a strange inability to react assertively and appropriately to the situation. For example, a person may just remain in his or her seat instead of heading toward the exit. Watch out for this in your fellow passengers or traveling companions. and wait for rescue. You stand a much higher chance of surviving if you just stay put. Don't wander off and look for help, or try to find something close by. If your plane went down, there will be people on the way quickly, and you want to be there when they arrive. Just stay put.
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One-sentence summary -- Protect yourself from smoke. Get out of the airplane as quickly as possible. Listen to the flight attendants’ post-crash instructions. Ditch your stuff. Get at least 500 feet (152.4 m) upwind from the wreckage. Stay in one place, but pay attention to what needs to happen. Call Emergency Services

Article: Ask an employee for help if you are not sure what to choose. Do not use chemicals from other sources. The chemicals sold at the pool supply store are at a specific concentration intended for pools.  Sodium thiosulfate is probably the most common chlorine neutralizer, but requires care when handling. Hydrogen peroxide is often the cheapest option, and breaks down into harmless substances. However, this is much less effective if your pool's pH is below 7.0. Never add chemicals to a pool while swimmers are using it. If other people have access to the pool, put up clear warning signs. Many pool chemicals can cause injury if they come into contact with lungs, eyes, or skin. Review this safety checklist before you continue:  Read the product label carefully for safe handling instructions. Follow all recommendations for safety equipment, and review emergency protocols. Store pool chemicals in a well-ventilated storage area, away from sunlight, heat, and moisture. Do not store acids and chlorine near each other. Do not store dry chemicals next to or underneath liquids. Only have one chemical container open at a time. Close the container and return it to storage before opening another. Always follow product instructions to determine how to add it to the pool, and how much to use. Many chemicals are available in different forms and in different concentrations, so a general guide cannot cover every option.   Generally, when adding sodium thiosulfate, allow for about 0.5 ounces (15mL) per 1,000 gallons (3,800L) water. If you're treating a public pool, go with a more accurate measurement. 2.6 ounces (77mL) sodium thiosulfate will lower chlorine by 1 ppm in 10,000 gallons (37,900L) of water. A pool store employee or an online pool chlorine lowering calculator can help you with this formula. Adding too much of the neutralizer can cause major problems: your chlorine can drop to zero, and the unused neutralizer will remain in the pool to destroy the next batch of chlorine as well. Use ⅓ or ½ as much as you calculated. Give the pool time to adjust according to label instructions. Test frequently and do not enter the pool until parameters are back to normal. If your measurements stabilize but chlorine is still too high, add another small dose of neutralizer. If your circulation system is slower than average, you may have to wait longer for the neutralizer to take effect. . These chemicals usually lower the pH of the pool. Be prepared to raise the pH once chlorine is back to normal. The pH value should be between 7.2 and 7.8, and ideally as close to 7.5 as you can get.
Question: What is a summary of what this article is about?
Purchase a chlorine neutralizer from a pool supply store. Close the pool. Follow safety precautions. Calculate how much you need. Add the neutralizer in small doses. Wait while testing frequently. Raise the pH if necessary