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(Abridged) We present a detailed analysis of a large sample of 31low-redshift, mostly radio-quiet type 1 QSOs observed with integral fieldspectroscopy to study their extended emission-line regions (EELRs). We focus onthe ionisation state of the gas, size and luminosity of extended narrow lineregions (ENLRs), which corresponds to those parts of the EELR dominated byionisation from the QSO, as well as the kinematics of the ionised gas. Wedetect EELRs around 19 of our 31 QSOs (61%) after deblending the unresolved QSOemission and the extended host galaxy light in the integral field data. Weidentify 13 EELRs to be entirely ionised by the QSO radiation, 3 EELRs arecomposed of HII regions and 3 EELRs display signatures of both ionisationmechanisms at different locations. The typical size of the ENLR is 10kpc at amedian nuclear [OIII] luminosity of log(L([OIII])/[erg/s])=42.7+-0.15. We showthat the ENLR sizes are least a factor of 2 larger than determined with HST,but are consistent with those of recently reported type 2 QSOs at matching[OIII] luminosities. The ENLR of type 1 and type 2 QSOs appear to follow thesame size-luminosity relation. Furthermore, we show for the first time that theENLR size is much better correlated with the QSO continuum luminosity than withthe total/nuclear [OIII] luminosity. We show that ENLR luminosity and radioluminosity are correlated, and argue that radio jets even in radio-quiet QSOsare important for shaping the properties of the ENLR. Strikingly, thekinematics of the ionised gas is quiescent and likely gravitationally driven inthe majority of cases and we find only 3 objects with radial gas velocitiesexceeding 400km/s in specific regions of the EELR that can be associate withradio jets. In general, these are significantly lower outflow velocities anddetection rates compared to starburst galaxies or radio-loud QSOs.

The properties of the extended warm ionised gas around low-redshift QSOs and the lack of extended high-velocity outflows