I doubt that this is within NASAs forte, if even possible, I also doubt that NASA care - they are hardly the greenest organisation. Even if scientists realised a way of producing O3, do you think that they could cover 5% of the earth? That is just ludicrious. Moving a small rain cloud? Possible yet expensive (discovered by the Russians away), producing a layer of O3 to cover 5% of the worlds atmosphere? (The British discovered O3 by the way) not only impossible but a venture which would bankrupt any country.