There are several natural means to create protection from radiation in the air. Radiation is energy that is radiated or transmitted in the form of rays, waves or particles.
While there are 2 types of radiation, particle and electromagnetic, it is the electromagnetic radiation carried by dust particles in the air from nuclear plants that we are most concerned with here. Nuclear radiation comes from hundreds of different kinds of unstable atoms. While many exist in nature, the majority are created in nuclear reactions. While radiation is a natural part of life (even before nuclear power plants existed) it is the large amounts of ionizing radiation from nuclear reactions that can affect the thyroid and cell health in the body. The ionizing radiation is emitted as the unstable atoms called radionuclides that change spontaneously to become different kinds of atoms.
Step #1: Protecting The Thyroid
I'm sure you've been reading about Potassium iodine being given to citizens in Japan as a means of making sure they protect the thyroid as much as possible. (which is the most effected organ in radiation). You can also eat kelp (high in iodine) as an alternative.
In a nuclear plants thick concrete and water cooled lead is used to maintain protection from nuclear radiation. Lead lined protection (which I'm sure you've experienced when getting X-rays) also protects the thyroid. While there are natural means to remove radiation from the body, prevention is a much better answer.
The HEPA filter was developed by the US government during the 1940's during the infamous Manhattan Project to create protection from radiation particles. Dust and other airborne matter can carry radioactive particles around the world via clouds and wind. HEPA was then commercialized in the 1950's as a means of removing pollen and dust for allergic people. HEPA is now also used in aerospace, pharmaceutical processing, hospitals, nuclear development plants, and for computer chip development.
The U.S. Department of Health has specific requirements for HEPA filters because of the nuclear application of these filters and importance to peoples safety. Air purifiers that claim to be "Hepa-like" , "Hepa-type", or 99% HEPA do not qualify. Even a small inexpensive air purifier like the one below can help remove radiation from the air.
STEP #3: Foods That Remove Radiation
Foods that can remove radiation from the body include:
Pectin - found in apples it has the ability to bind radioactive residues and remove them from the body. Pectin is as a natural chelating agent.
Chlorophyl - several studies now show that chlorophyll-rich foods like chlorella, spirulina (and even alfalfa) can decrease radiation toxicity. Chlorella can neutralize radiation and also mercury-related problems in the body. It can remove poisonous substances like cadmium and PCBs. It can also detoxify uranium, copper and lead. Several of the foods that contain chlorophyll include leafy green plants, celery, parsley, and wheatgrass.
[note: I've been testing the use of chlorox to remove radiation from food. Several drops of pure chlorox in a tub of water can remove bacteria, and pesticides from food]
One more thing: During periods of high winds when nuclear particles are present in high amounts staying indoors will prevent the absorption of many charged particles. I hope these suggestions put you at ease and have helped you gain some direction on how to get protection from radiation.