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Hydrofluorocarbons (HFCs) were developed to replace a type of chemical that impacted the ozone layer in our upper atmosphere, but these replacements are potent greenhouse gases. There are a variety of rules under review that would require tighter controls and also help companies to find safer alternatives.
In medicinal use, it's the substance that attacks the bacteria/virus/tumor. In pesticide use, it's the substance that kills or repels pests. Air emissions : Any gas emitted into the atmosphere from industrial or commercial activity. Typically used in conjunction with “greenhouse gas” but some emissions are not GHGs.
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