Used as a calibration standard in gas chromatography and mass spectrometry for accurate identification and quantification of aromatic hydrocarbons in environmental and industrial samples. Commonly applied in air quality monitoring to measure volatile organic compounds (VOCs), especially in urban and industrial atmospheres. Also utilized in laboratory research for solvent analysis and in the validation of analytical methods for hydrocarbon mixtures. Its precise concentration makes it ideal for creating calibration curves in trace-level detection of methylbenzenes.