Numbers of sites or components impacted by different elements of each regulation. Green bars indicate baseline number of active oil and gas facilities or components in 2018. Numbers of sites subject to the AER and ECCC venting limits (“incl. sites”) are shown alongside the number of sites initially exceeding those limits (“>limit”). Middle section shows estimated numbers of different pneumatic equipment types subject to actions under each regulation. Numbers of facilities impacted by LDAR rules distinguishes number subject to one- (pink) and three-times (red) per year inspections. DOI: https://doi.org/10.1525/elementa.403.f2