Terrorism and Other Public Health Threats - Air Contamination
Chemicals are the most likely source of air contamination. An accident at a plant or factory or a train wreck might release large amounts of a hazardous chemical into the air, for instance. A terrorist attack could involve the deliberate release of a toxic chemical or gas.
In a bioterror attack, bacteria or viruses causing diseases such as anthrax, pneumonic plague, smallpox, or tularemia could be released in an aerosol form. Anyone who inhaled the substance could be affected.
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Although air itself does not become radioactive, the release of radiation into the environment can create radioactive dust and dirt (fallout) that can make the air unsafe. A "dirty bomb" could work in this manner, causing a relatively minor explosion but doing its real damage by releasing radioactive materials into the environment.
What you can do
You cannot do much in advance to protect yourself from a hazardous substance released into the air. If there hasn't been an obvious explosion or a known terrorist attack, the air could become contaminated without anyone knowing it until people or animals start to develop symptoms.
As with other potential emergencies, it makes sense to have a disaster kit with water, food, first aid items, tools, and other essentials. Concern over terrorist threats has prompted some people to consider adding the following items to their supplies:
- Duct tape and plastic sheeting for "sheltering in place." Sheltering in place involves temporarily sealing yourself inside a room in your home or another indoor location and shutting off sources of ventilation so that outside air doesn't get in.
- Masks. In general, masks are helpful only if you know how and when to use them and if they are properly fitted. They are not recommended for the general public. You do not need to purchase or wear any kind of protective mask unless civil or health authorities in your area tell you to do so.
- Potassium iodide tablets. Potassium iodide, also known as KI, helps protect your thyroid gland from the harmful effects of radioactive iodine, which could be released as a result of a dirty bomb, an explosion at a nuclear power plant, or any other nuclear incident. The KI is taken up by your thyroid gland and prevents the radioactive iodine from accumulating there. Potassium iodide does not protect against any other radioactive substances.
Vaccines for anthrax and smallpox are available for certain high-risk groups but are not recommended for the general public at this time. In 2007, the U.S. Food and Drug Administration (FDA) approved the first vaccine for humans against bird flu (avian influenza). Immunization is not currently recommended for the public. The vaccine will be kept in the U.S. government stockpile.1 For more information, see the Bioterrorism and Vaccinations section of this topic.
If a hazardous substance is released into the environment:
- Get out of the immediate area if possible. If the release has occurred outdoors, go inside. If it has occurred indoors, go outside. Move out of low-lying spots to higher ground, because most chemicals released into the environment are heavier than air and will sink.
- Tune into a local radio or TV station for instructions from public health and emergency officials. Phone lines are likely to be overwhelmed during a public health emergency. So do not try to call for instructions. Information also may be available over the Internet. Depending on the kind of release, authorities may advise you to shelter in place or simply to stay indoors. You do not need to leave your community unless local authorities tell you to.
- If you are directly exposed to radioactive dust, dirt, or other fallout, follow the steps for personal decontamination to get the substance off your skin as quickly and completely as possible.
- Do not take potassium iodide (KI) tablets unless local authorities tell you to. These tablets are effective against radioactive iodine only, and they can be harmful if taken improperly.
WebMD Medical Reference from Healthwise
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