This paper presents an evaluated compilation of equilibrium relative humidities in air versus temperature for 28 binary saturated aqueous solutions, ranging from about 3 to 98 percent relative humidity. The data, derived from 21 separate investigations and 1106 individual measurements, were fitted using the method of least squares to regular polynomial equations with two to four coefficients. The equations and tables are provided, along with estimated uncertainties in the correlated results. The study highlights the advantages of using binary saturated aqueous solutions for humidity control, particularly in terms of cost and simplicity compared to humidity generators. The methods for measuring relative humidity, including equilibrium vapor pressure measurement, calibration with a humidity sensor, and gravimetric determination, are discussed. The paper also addresses the challenges and errors associated with these methods and provides a detailed method for data fitting and uncertainty estimation. The results are compared with those from other compilations, showing agreement within specified uncertainties for most of the evaluated salt solutions.This paper presents an evaluated compilation of equilibrium relative humidities in air versus temperature for 28 binary saturated aqueous solutions, ranging from about 3 to 98 percent relative humidity. The data, derived from 21 separate investigations and 1106 individual measurements, were fitted using the method of least squares to regular polynomial equations with two to four coefficients. The equations and tables are provided, along with estimated uncertainties in the correlated results. The study highlights the advantages of using binary saturated aqueous solutions for humidity control, particularly in terms of cost and simplicity compared to humidity generators. The methods for measuring relative humidity, including equilibrium vapor pressure measurement, calibration with a humidity sensor, and gravimetric determination, are discussed. The paper also addresses the challenges and errors associated with these methods and provides a detailed method for data fitting and uncertainty estimation. The results are compared with those from other compilations, showing agreement within specified uncertainties for most of the evaluated salt solutions.