Maya Angelou recites her poem 'On the Pulse of Morning' at the inauguration of President Bill Clinton on January 20, 1993.
Pregnant women could also go for a swim at a swimming pool, but it can also be risky in some circumstances. The chemicals used in swimming pools can be dangerous for moms-to-be and their babies, if too much is being added to the water, but normal levels of chlorine are generally OK unless the water is ingested.
The current water standard for nitrate is based on levels considered low enough to protect infants from methemoglobinemia. 1  Some published results suggest a possible association between nitrate exposure during pregnancy and human malformations [Croen et al 2001; Brender et al 2004; Brender et al 2011].