Table 2:

Policy impact on local Hg deposition (Δμg/m²/yr, percent in parentheses) assuming an immediate implementation and no legacy penalty (traditional method). Policy impact is calculated as the difference in deposition between FUTURE and BASE simulations. The following columns give the percent change in policy impact depending on year of implementation, i.e., length of the delay. The percent change in policy impact is calculated according to Equation (1). The mean percent change in policy impact is the average percent change due to a near-term (2020-2035) 5-year delay, calculated according to Equation (2). New Policy (NP) and Maximum Feasible Reduction (MFR) refer to future global emissions scenarios developed by Pacyna et al.⁹.

	Policy impact in Δμg/m2/yr under traditional method (% change vs. present)	Percent change in policy impact (%)
Year of implementation	Traditional method	2020	2025	2030	2035	2050	mean
Global average
NP	−1.4 (−13.6%)	−33.6	−48.5	−62.7	−76.2	−114.1	−14.2
MFR	−2.5 (−23.8%)	−19.1	−27.5	−35.5	−43.2	−64.6	−8.0
Global legacy penalty (Mg)	0.0	272	392	506	615	921	114.5
Maine, USA (A)
NP	−2.9 (−15.3%)	−29.5	−42.6	−55.0	−66.9	−100.0	−12.5
MFR	−4.9 (−25.8%)	−17.5	−25.3	−32.7	−39.7	−59.5	−7.4
Ahmedabad, India (B)
NP	+4.2 (+25.9%)	−12.7	−18.4	−23.7	−28.9	−43.2	−5.4
MFR	−6.3 (−38.4%)	−8.6	−12.4	−16.0	−19.5	−29.2	−3.6
Shanghai, China (C)
NP	−6.3 (−55.1%)	−2.7	−3.9	−5.0	−6.1	−9.1	−1.1
MFR	−7.8 (−68.3%)	−2.2	−3.1	−4.1	−4.9	−7.4	−0.9
South Pacific (D)
NP	−1.7 (−12.9%)	−38.3	−55.3	−71.4	−86.9	−130.1	−16.2
MFR	−3.0 (−22.1%)	−22.8	−32.8	−42.4	−51.6	−77.2	−9.6