... total of $354,352,000 in direct use value. PARK VALUE IN ACTIONProviding Direct Use Value in Boston Value ($)$146,230,236$147,812,453$60,309,713$354,352,402 Shared Benefits: The Economic Value ... externality value of a short ton of carbon monoxide is $870; the externality value of the same amount of sulfur dioxide is $1,500.)Washington, D.C.’s Rock Creek Park has more than 1,500 acres of trees ... DiegoDirect Use Value 5Park Value in Action: Providing Direct Use Value in Boston Health Value 7Park Value in Action: Promoting Human Health in SacramentoCommunity Cohesion Value 9Park Value in...