<p>This article presents a methodology for measuring the deterioration of job quality in the Member States of the European Union through the application of Principal Component Analysis (PCA), with the aim of confirming the advance of labor precariousness across labor markets, despite the economic, productive, and institutional particularities of each country. This statistical technique allows for the construction of a composite indicator for each year which, when complemented by additional indicators derived from the average of standardized variables, facilitates the assessment of the regional impact of this phenomenon between 2007 and 2021. The comparative analysis between countries is based on data from the Eurostat Labour Force Survey, allowing for the identification of both common patterns and divergences in the evolution of job quality, while also distinguishing predominant regional trends. The results reveal significant disparities in job quality among Member States, with a high initial level of labor precariousness observed in the peripheral regions of Eastern Europe and a marked increase in precariousness across the Mediterranean economies.</p>