I am trying to plot presence/absence (1/0) of a sample species against various environmental variables.

I have put presence/absence on the y-axis and the environmental variable (in this case barometric pressure) on the x axis, however the resulting plot looks terrible. 

[![Scatterplot of presence (1) and absence (0) against barometric pressure](https://i.stack.imgur.com/gSRnh.jpg)](https://i.stack.imgur.com/gSRnh.jpg)

Is there a better way to do this? I thought of plotting presence/absence against the frequency of the environmental variable, would this be possible?