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In particular, women who could become pregnant should take 400 micrograms of folic acid every day to reduce the risk of neural tube birth defects like spina bifida. Fine particulates in smoke blowing in from the 17-day-old Day Fire in Ventura County topped more than 130 micrograms per cubic meter in early afternoon, according to monitoring by the Antelope Valley Air Pollution Control District, which issued a health advisory warning people to stay indoors and limit prolonged exertion. Further investigation has revealed that about 30 percent of wells in Bangladesh contain arsenic levels of more than 50 micrograms per liter ([micro]g/L) of water, and 5 to 10 percent of the country's wells test at levels of more than 300 micrograms per liter. |
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