EUR/PLN is rising today as resilient to Chinese risk aversion just yesterday Polish zloty fell under pressure today. This can be explained by reduction of exposure on CEE countries amid increased plunges on global stock markets. When this risk aversion finishes, EURPLN shall be a really attractive pair to short. This is because of fundamentals that point at discrepancies between the sluggish euro zone and the quite robust Polish economy.
As far as concrete levels are concerned, 4.26 is a really attractive level in terms of risk/reward ratio to short the pair.