All panels contain a dashed line at zero correlation as a guide. Left: the autocorrelation function of ALLWISE obscured and unobscured quasars, illustrating both the agreement between the two methods (see Sections 3.1 and 3.2) and the lack of signal on large scales for both samples. Center, right: cross-correlation of the samples with Galactic extinction in the g band (A_g; centre), and the Moon level in the WISE imaging tiles (right). The correlation of the data with A_g appears to be primarily driven by the obscured sample, while the correlation with the Moon level is similar for both.