Abstract: A paint-spraying booth apparatus includes a floor over which objects e.g. motor vehicle bodies to be spray painted pass, the floor being permeable to air, a reservoir beneath the floor containing water, conduits extending downwardly from the reservoir, the reservoir and the conduits being arranged so that paint-containing air passing through the floor mixes with water from the reservoir, the resulting mixture passing through the conduits. An impingement member is spaced from the outlet of each conduit and disposed so that the mixture flowing through the conduit impinges thereon. A guard member surrounds each conduit and the respective impingement member to urge said mixture, after contact with the latter, to travel substantially downwardly. A first collecting chamber is arranged to collect a water/paint component of said mixture beneath the guards and second collecting chamber is arranged to collect a substantially paint-free air component of the mixture.