Ok, thanks for the reply. Seeing the many issues wrt to Seeed’s implementation of these sensors I do NOT believe it is possible to use the Winsec curves to get a proper ppm. I posted the explanation in the comment section here: Grove - Gas Sensor V2(Multichannel) | Seeed Studio Wiki
However I think it is possible to develop a rough ppm estimate (in various T / RH conditions) by comparing each sensor’s output to an equivalent sensor from a reliable company (like Sensirion whose sensors are auto-compensated vs T/RH). Shooting for publishing that code in a couple of months. Hoping to get to -50% to +100% precision (so pretty bad but in the ballpark, and leap & bounds better than seeed’s misleading sketches).
Will post when done, as a part of this series (gave you a shoutout 
): [DIY] Air Quality Monitor & Datalogger (PM,VOC,NOx,COx,T°,H%) - Part 1 Introduction