Our nation's clean air standards have helped reduce pollution.
(Our nation's clean air standards; have helped; reduce pollution) Context(Our nation 's clean air standards have helped,List([0, 44))):(Our nation's clean air standards; have helped reduce; pollution)
Our nation 's clean air standards have helped,List([0, 44))
Our nation's clean air standards Our nation's clean air standards
have helped have helped reduce
reduce pollution
pollution