<P> Pesticides in the United States are used predominantly by the agricultural sector, but approximately a quarter of them are used in houses, yards, parks, golf courses, and swimming pools . </P> <P> Atrazine is the second-most commonly used herbicide in the United States after glyphosate, with application of approximately 76,000,000 pounds (34,000 t) of the active ingredient in 1997 . </P>

The total amount of pesticides used in the united states is