What is the name of the treaty signed by canada and the united states, that was meant to control pollution along a portion of their shared border?

In 1991, Canada and the United States established the air quality agreement to address transboundary air pollution. The Agreement initially focused on reducing levels of acid deposition, or acid rain, in each country. In 2000, the Agreement was updated to include ground-level ozone.

answer; no longer than a reasonable period of time;