Table 3.
Regional emission reductions for existing single-family homes increasing insulation from current practice to IECC 2000 levels.
| Northeast (NE/MA) | Midwest (ENC/WNC) | South (SA/ESC/WSC) | West (MTN/PA) | Total | |
| PM2.5 (tons/year, % of national total) | |||||
| Electricity | 82 (4%) | 260 (12%) | 1,600 (74%) | 210 (10%) | 2,100 |
| Residential (NG + Oil) | 210 (21%) | 480 (49%) | 200 (20%) | 94 (10%) | 990 |
| Total | 290 (9%) | 740 (24%) | 1,800 (57%) | 300 (10%) | 3,100 |
| SO2 (tons/year, % of national total) | |||||
| Electricity | 9,100 (5%) | 21,000 (12%) | 130,000 (78%) | 8,300 (5%) | 170,000 |
| Residential (NG + Oil) | 14,000 (69%) | 3,000 (15%) | 3,100 (15%) | 260 (1%) | 20,000 |
| Total | 23,000 (12%) | 24,000 (12%) | 140,000 (71%) | 8,600 (4%) | 190,000 |
| NOx (tons/year, % of national total) | |||||
| Electricity | 2,900 (4%) | 9,300 (12%) | 57,000 (74%) | 7,500 (10%) | 77,000 |
| Residential (NG + Oil) | 6,800 (28%) | 11,000 (44%) | 4,700 (20%) | 2,000 (8%) | 24,000 |
| Total | 9,700 (10%) | 20,000 (20%) | 62,000 (61%) | 9,500 (9%) | 100,000 |
Note: Estimates are presented to two significant figures; sums may not add due to rounding. Percentages represent the fraction of benefits within each region.