gas sensor mq131

i am using a ozone gas sensor mq131 with arduino for measuring ozone gas and i am getting output in voltage form now i want to convert it into ppm. Can anyone tell how i should convert voltage into ppm and calibrate this sensor.

sensor link

https://www.sainsmart.com/products/mq-131-gas-sensor-ozone-module

Take gas sample with known ozone concentration, check output value. Take second gas sample with different ozone concentration, check output value. If you're sure it's linear: calibration done. But better is to take a few more samples, roughly evenly spread over the target ozone level range, to make sure it really is linear, or if not to have a better calibration curve.