The International Halocarbons in Air Comparison Experiment (IHALACE) was conducted to document relationships between calibration scales among various laboratories that measure atmospheric greenhouse and ozone depleting gases. This study included trace gases such as chlorofluorocarbons (CFCs). hydrochlorofluorocarbons (HCFCs). and hydrofluorocarbons (HFCs). https://mabelandfoxs.shop/product-category/learning-cards/