Characteristics of 2-methyltetrols in ambient aerosol in Beijing, China

► First ambient aerosol measurements of 2-methyltetrols by HPAEC. ► A clear seasonal variation of 2-methyltetrol levels observed in PM2.5 and PM10. ► 2-Methyltetrols can still be detected during the winter in Beijing, China. ► Meteorological factors have various effects on the concentrations of 2-methyltetrols. ► Aerosol acidity may promote the formation of 2-methyltetrols in urban areas.