1-Aryl-pyrazoles of the general formula ##STR1## in which Hal represents halogen,R.sup.1 and R.sup.3 independently of one another represent cyano, nitro, halogen, alkyl, alkoxy, alkoxycarbonyl, halogenoalkyl, halogenoalkoxy or a radical --S(O).sub.n --R.sup.6 andR.sup.2, R.sup.4 and R.sup.5 independently of one another and independently of R.sup.1 and R.sup.3 represent the same radicals as R.sup.1 and R.sup.3, and additionally represent hydrogen,and whereinR.sup.6 represents alkyl, halogenoalkyl, amino, alkylamino or dialkylamino and n-represents the number 0, 1 or 2 are disclosed.These compounds can be nitrated to form herbicially effective 1-aryl-4-nitropyrazoles.