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The pressure of hot gas in groups and clusters of galaxies is a key physicalquantity, which is directly linked to the total mass of the halo and severalother thermodynamical properties. In the wake of previous observational workson the hot gas pressure distribution in massive halos, we have investigated asample of 31 clusters detected in both the Planck and Atacama CosmologyTelescope (ACT), MBAC surveys. We made use of an optimised Sunyaev-Zeldovich(SZ) map reconstructed from the two data sets and tailored for the detection ofthe SZ effect, taking advantage of both Planck coverage of large scales and theACT higher spatial resolution. Our average pressure profile covers a radialrange going from 0.04xR_500 in the central parts to 2.5xR_500 in the outskirts.In this way, it improves upon previous pressure-profile reconstruction based onSZ measurements. It is compatible, as well as competitive, with constraintsderived from joint X-ray and SZ analysis. This work demonstrates thepossibilities offered by large sky surveys of the SZ effect with multipleexperiments with different spatial resolutions and spectral coverages, such asACT and Planck.

PACT. II. Pressure profiles of galaxy clusters using Planck and ACT