Carl Pope makes a good case for retrofitting trucks with diesel filters, which costs about $10,000 a truck, to reduce deadly air pollution. But the benefit is to the public. Why should the truck owner bear the burden while getting no direct benefit?
I suggest that the retrofit be subsidized by taxpayers because they receive the benefit. Among the advantages of this approach is that the retrofits will be done sooner and the savings from costly enforcement programs can be used to actually get the job done.