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Radon is responsible for the majority of public exposure to ionizing radiation. It is often the single largest contributor to an individual's background radiation dose, and is the most variable from location to location. Radon gas from natural sources can accumulate in buildings, especially in confined areas such as attics and basements.
In a working mine, the radon level can be controlled by ventilation, sealing off old workings and controlling the water in the mine. The level in a mine can go up when a mine is abandoned; it can reach a level which can cause the skin to become red (a mild radiation burn). The radon levels in some of the mines can reach 400 to 700 kBq m −3. [17]
Radon and its daughters are, taken together, often the single largest contributor to an individual's background radiation dose, but due to local differences in geology, [6] the level of exposure to radon gas differs by location. A common source of environmental radon is uranium-containing minerals in the ground; it therefore accumulates in ...
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Radon escapes from the ground into the air, where it produces further radioactive particles as it decays. When people breathe those particles in, they are deposited on cells lining the airways.
Houston's air quality has often been compared to Los Angeles and Beijing. [49] Houston has introduced many programs since the 2000 federal order to reduce air pollution in the city. [citation needed] The most notable project was the METRORail light rail system constructed in 2004. The light rail system was designed to encourage Houstonians to ...
Map of Humble Humble is located at 29°59′42″N 95°15′54″W / 29.99500°N 95.26500°W / 29.99500; -95.26500 (29.994920, –95.264873 According to the United States Census Bureau , the city has a total area of 9.9 square miles (26 km 2 ), of which 9.9 square miles (26 km 2 ) is land and 0.10% is water.