For some of the emerging market currencies, recent rout has been worst since financial crisis (2008/09), for some worst since Asian currency crisis (1997), for some worst since Taper Tantrum (2013) and for some, worst on record.

China's recent devaluation of Yuan just increased the pain of emerging market FX, which lost further grounds and fast since China's devaluation. Debasing Yuan just pulled an anchor for emerging market currencies, especially Asian ones.

Market participants are worried that China might be weaker than many had originally assumed, which is overall bad news for emerging markets. China consumes lot of exports of emerging market and with further slowdown in mainland, risks emerging markets.

Moreover, speculation has been going up for further devaluation from China, either controlled or uncontrolled.

The chart represents some of the prominent emerging market's currencies since first devaluation of Yuan on August 11th. Drop would be larger if today's move is considered, data till Friday.