Logarithm of the production rates and dust-to-gas ratios as a function of OH and CN over time around perihelion for comet C/2021 A1. The dust-to-gas ratio is indicated in cm/molecules/s. The mean values and ranges of abundance ratios corresponding to the typical comets taxonomic family, as defined by A’Hearn et al. (1995), are indicated in blue; the mean values and ranges for the carbon-depleted family are shown in green (only for C₂). Outburst dates, indicated by blue arrows, are not correlated with significant changes in abundance ratios or dust-to-gas ratios.