Mentions of "mask OR masks OR n95" have been skyrocketing since late January, as can be seen in the timeline below:
Zooming to the period January 1, 2020 to present, the timeline below shows that mentions shot up on January 21st, reaching a peak on February 2nd, before decreasing steadily through Feb. 20th. Since the 20th, however, they have been increasing linearly upwards.
