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

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.