Number of products from Figure 24 with statistically significant positive and negative trends per grid cell. (a) Number of products from Figure 24 that indicate a statistically significant positive trend in each 5° × 5° grid cell. All six products shows significant ozone increases in five grid cells, all above Southeast Asia. (b) As in (a) but for statistically significant negative trends. DOI: https://doi.org/10.1525/elementa.291.f25