Phenoxy herbicide production was responsible for 50% of which emissions?

Phenoxy herbicide production was responsible for 50% of which emissions?

• A. Dioxin
• B. Carbon monoxide
• C. Sulfur dioxide
• D. Methane

Answer: (A)

Dioxin emissions are the key idea here. Dioxins are highly toxic, persistent pollutants that form as unintentional byproducts during the manufacturing of chlorinated phenoxy herbicides (like 2,4-D and related compounds). In historical data, a large share of dioxin releases came from the production and handling of these herbicides, making about half of the emissions attributed to that industry. The other listed pollutants—carbon monoxide, sulfur dioxide, and methane—are common combustion or decomposition byproducts not specifically tied to phenoxy herbicide production, so they don’t match the source described.

Dioxin emissions are the key idea here. Dioxins are highly toxic, persistent pollutants that form as unintentional byproducts during the manufacturing of chlorinated phenoxy herbicides (like 2,4-D and related compounds). In historical data, a large share of dioxin releases came from the production and handling of these herbicides, making about half of the emissions attributed to that industry. The other listed pollutants—carbon monoxide, sulfur dioxide, and methane—are common combustion or decomposition byproducts not specifically tied to phenoxy herbicide production, so they don’t match the source described.