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We have developed a unified aspiration efficiency model for sampling with round inlets at 0-90°forward angles from horizontal aerosol flows. The aspiration efficiency is represented by a single equation as a function of the sampling angle, the ratio of wind to inlet velocity, and different inertial parameters for 0-60°and 45-90°sampling. The equation for 45-90°s ampling is an extension of the Laktionov equation for 90°. The new model fits the experimental data within experimental accuracy.