Hi, i have just bought a Dyson air purifier cool, because I moved to the UAE and the air quality is terrible here. I turned it on and it showed that the air in my home is perfectly clean. Outside it is unhealthy, almost reaching the toxic dangerous level, so it is hard to belive that in my home literally next to the main highway the co2 is zero and all the other numbers are close to zero. I put it to my balcony and after 20 minutes it went up a little, but still showed good. I am vert disappointed. What is wrong with my purifier?