Carbon Monoxide (CO)

National Emission Trends (thousand short tons)

Source Category 1970 1975 1980 1985 1990 1991 FUEL COMB. ELEC. UTIL. 237 276 322 291 363 349 FUEL COMB. INDUSTRIAL 770 763 750 670 879 920 FUEL COMB. OTHER 3,625 3,441 6,230 7,5254,2694,587 CHEMICAL & ALLIED PRODUCT MFG 3,397 2,204 2,151 1,845 1,183 1,127 METALS PROCESSING 3,644 2,496 2,246 2,223 2,640 2,571 PETROLEUM & RELATED INDUSTRIES 2,179 2,211 1,723 462 333 345 OTHER INDUSTRIAL PROCESSES 620 630 830 694 537 548 SOLVENT UTILIZATION NA NA NA 2 5 5 STORAGE & TRANSPORT NA NA NA 49 76 28 WASTE DISPOSAL & RECYCLING 7,059 3,230 2,300 1,941 1,079 1,116 HIGHWAY VEHICLES 163,231153,555143,827134,187110,255104,980 OFF-HIGHWAY 11,37114,32916,68519,02921,44721,934 MISCELLANEOUS 7,909 5,263 8,344 7,92711,122 8,618

TOTAL 204,042188,398185,408176,845154,188147,1281992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003

350 363 370 372 408 423 451 496 484 485 657 652 955 1,043 1,041 1,056 1,188 1,162 1,151 1,213 1,219 1,253 1,267 1,229 4,8494,181 4,1084,506 2,741 2,742 2,727 3,829 3,081 3,088 3,550 3,477 1,112 1,093 1,171 1,223 1,053 1,071 1,081 350 361 372 284 259 2,496 2,536 2,475 2,380 1,599 1,710 1,702 1,255 1,295 1,380 987 934 371 371 338 348 354 367 366 159 161 162 357 355 544 594 600 624 561 582 590 571 592 615 490 504 5 5 5 6 1 2 2 52 51 50 2 2 17 51 24 25 70 71 72 163 169 178 118 114 1,138 1,248 1,225 1,185 2,904 2,948 3,121 3,019 1,849 1,851 1,594 1,580 99,70594,43189,15683,88178,60675,84973,24468,70868,06163,47660,59656,579 22,41922,90423,38923,87424,35823,66823,68923,31624,17824,67722,66221,999 6,934 7,082 9,656 7,29815,016 7,316 7,18411,41012,964 8,67618,49317,364

140,895135,902133,558126,778128,859117,911115,380114,541114,465106,263111,057105,0782004 2005 2006 2007 2008

647 643 661 680 699 1,190 1,152 1,173 1,195 1,216 3,404 3,331 3,343 3,356 3,369 233 208 227 246 265 882 829 869 908 947 353 351 352 353 355 519 534 522 511 500 2 2 2 2 2 111 107 110 113 115 1,567 1,554 1,564 1,574 1,584 52,56248,54445,318 42,092 38,866 21,33620,67219,793 18,915 18,036 16,23515,10613,981 12,856 11,731

99,04193,03487,915 82,801 77,685Ammonia (NH3)

National Emission Trends (thousand short tons)

Source Category 1990 1991 1992 1993 1994 1995 FUEL COMB. ELEC. UTIL. 0 0 0 0 0 0 FUEL COMB. INDUSTRIAL 17 17 17 18 18 18 FUEL COMB. OTHER 8 8 8 8 8 8 CHEMICAL & ALLIED PRODUCT MFG 183 183 183 183 183 183 METALS PROCESSING 6 6 6 6 6 6 PETROLEUM & RELATED INDUSTRIES 43 43 43 43 43 43 OTHER INDUSTRIAL PROCESSES 38 38 39 39 40 40 SOLVENT UTILIZATION NA NA NA NA NA NA STORAGE & TRANSPORT 0 0 0 0 0 0 WASTE DISPOSAL & RECYCLING 82 86 89 93 93 93 HIGHWAY VEHICLES 155 169 182 195 209 222 OFF-HIGHWAY 31 35 35 36 36 37 MISCELLANEOUS 3,757 3,799 3,841 3,897 3,953 4,009

TOTAL 4,320 4,3844,443 4,518 4,589 4,6591996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006

6 6 8 11 11 11 29 28 27 27 29 34 33 33 31 31 31 17 17 17 17 16 7 7 6 8 8 8 18 18 17 17 17 123 125 130 25 26 27 23 23 23 23 23 5 5 5 2 2 2 3 3 3 3 3 16 17 17 9 10 10 3 3 3 3 3 43 45 45 48 50 52 177 177 177 177 168 0 0 0 0 0 0 0 0 0 0 0 1 1 1 5 5 5 1 1 1 1 1 84 84 86 82 83 85 26 26 26 26 26 236 265 256 267 275 278 294 298 302 307 306 34 34 35 3 3 3 3 3 3 3 3 4,1384,1954,3184,366 4,403 3,177 3,539 3,539 3,539 3,539 3,540

4,727 4,817 4,940 4,857 4,907 3,689 4,133 4,1364,138 4,143 4,1352007

32 16 17 23 3 3 159

1 26 307 3 3,541

4,131Nitrogen Oxides (NOx)

National Emission Trends (thousand short tons)

Source Category 1970 1975 1980 1985 1990 1991 FUEL COMB. ELEC. UTIL. 4,900 5,694 7,024 6,127 6,663 6,519 FUEL COMB. INDUSTRIAL 4,3254,007 3,555 3,209 3,035 2,979 FUEL COMB. OTHER 836 785 741 712 1,196 1,281 CHEMICAL & ALLIED PRODUCT MFG 271 221 213 262 168 165 METALS PROCESSING 77 73 65 87 97 76 PETROLEUM & RELATED INDUSTRIES 240 63 72 124 153 121 OTHER INDUSTRIAL PROCESSES 187 182 205 327 378 352 SOLVENT UTILIZATION 0 0 0 2 1 2 STORAGE & TRANSPORT 0 0 0 2 3 6 WASTE DISPOSAL & RECYCLING 440 159 111 87 91 95 HIGHWAY VEHICLES 12,62412,06111,49310,932 9,592 9,449 OFF-HIGHWAY 2,652 2,968 3,353 3,576 3,781 3,849 MISCELLANEOUS 330 165 248 310 369 286

TOTAL 26,88226,37827,08025,75725,52725,1801992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003

6,504 6,651 6,565 6,384 6,164 6,276 6,232 5,721 5,330 4,917 4,7094,404 3,071 3,151 3,147 3,144 3,151 3,101 3,050 2,709 2,723 2,757 2,041 1,967 1,353 1,308 1,303 1,298 1,197 1,177 1,101 768 766 779 738 735 163 155 160 158 125 127 129 102 105 107 70 67 81 83 91 98 83 89 89 86 89 94 69 68 148 123 117 110 139 143 143 120 122 124 354 354 361 370 389 399 433 460 467 451 479 504 429 447 3 3 3 3 2 3 3 4 4 4 7 6 5 5 5 6 15 16 16 14 15 16 19 18 96 123 114 99 153 157 163 162 129 130 111 122 9,306 9,162 9,019 8,876 8,733 8,792 8,619 8,371 8,394 7,774 7,870 7,411 3,915 3,981 4,047 4,113 4,1794,1784,156 4,084 4,1674,156 4,5074,634 255 241 390 267 412 187 179 251 276 184 211 231

25,26125,35625,35024,95524,78624,70624,34722,84322,59921,54621,13520,4642004 2005 2006 2007 2008

4,098 3,792 3,446 3,320 3,006 1,894 1,820 1,826 1,832 1,838 733 730 729 728 727 64 61 63 65 67 67 66 67 68 68 354 354 352 351 350 464 482 461 439 418 5 4 5 6 6 17 16 17 18 18 134 146 137 129 120 6,951 6,492 6,063 5,635 5,206 4,761 4,8884,677 4,466 4,255 251 271 267 264 260

19,79319,12218,110 17,321 16,339Particulate Matter 10 Micrometers in Diameter and Smaller (PM10)

National Emission Trends, without Condensables (thousands short tons)

Source Category 1970 1975 1980 FUEL COMB. ELEC. UTIL. 1,775 1,191 879 FUEL COMB. INDUSTRIAL 641 564 679 FUEL COMB. OTHER 455 492 887 CHEMICAL & ALLIED PRODUCT MFG 235 127 148 METALS PROCESSING 1,316 825 622 PETROLEUM & RELATED INDUSTRIES 286 179 138 OTHER INDUSTRIAL PROCESSES 5,832 2,572 1,846 SOLVENT UTILIZATION NA NA NA STORAGE & TRANSPORT NA NA NA WASTE DISPOSAL & RECYCLING 999 371 273 HIGHWAY VEHICLES 480 456 432 OFF-HIGHWAY 164 209 257 MISCELLANEOUS 839 569 852

TOTAL 13,022 7,555 7,0131985 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000

280 295 257 257 279 273 268 289 295 229 227 225 247 270 233 243 257 270 302 238 232 229 209 211 1,009 631 657 683 588 570 610 380 381 378 417 457 58 77 68 71 66 76 67 63 64 65 36 37 220 214 251 250 181 184 212 144 151 150 65 67 63 55 43 43 38 38 40 29 30 30 29 29 611 583 520 506 501 495 511 325 336 338 282 293 2 4 5 5 6 6 6 6 6 6 17 17 107 102 101 117 114 106 109 81 83 84 69 71 278 271 276 278 334 313 287 454 468 488 467 361 408 387 370 354 337 321 304 287 274 256 241 230 304 328 331 333 335 337 339 341 337 332 336 322 37,73624,53624,23323,95824,32825,61922,76520,22020,25320,30720,17920,642

41,32327,75327,34527,09827,36428,60825,82022,85722,91022,89222,57422,9622001 2002 2003 2004 2005 2006 2007 2008

258 219 218 217 215 184 153 122 220 251 238 225 212 206 199 192 459 69 69 68 67 67 68 68 38 36 32 27 22 23 24 25 71 64 51 38 25 23 21 20 30 22 19 15 12 10 9 8 305 867 848 829 810 796 782 768 18 8 7 5 4 4 4 4 74 51 45 40 34 34 34 34 362 235 233 232 231 231 231 231 212 203 200 196 193 186 178 171 317 311 322 334 345 331 318 304 20,57316,09516,09516,09516,09514,054 12,013 9,972

22,93718,43118,37718,32118,26516,149 14,034 11,919Particulate Matter 10 Micrometers in Diameter and Smaller (PM10)

National Emission Trends, with Condensables from 1999 forward (thousands short tons)

Source Category 1970 FUEL COMB. ELEC. UTIL. 1,775 FUEL COMB. INDUSTRIAL 641 FUEL COMB. OTHER 455 CHEMICAL & ALLIED PRODUCT MFG 235 METALS PROCESSING 1,316 PETROLEUM & RELATED INDUSTRIES 286 OTHER INDUSTRIAL PROCESSES 5,832 SOLVENT UTILIZATION NA STORAGE & TRANSPORT NA WASTE DISPOSAL & RECYCLING 999 HIGHWAY VEHICLES 480 OFF-HIGHWAY 164 MISCELLANEOUS 839

TOTAL 13,0221975 1980 1985 1990 1991 1992 1993 1994 1995 1996 1997 1998

1,191 879 280 295 257 257 279 273 268 289 295 229 564 679 247 270 233 243 257 270 302 238 232 229 492 887 1,009 631 657 683 588 570 610 380 381 378 127 148 58 77 68 71 66 76 67 63 64 65 825 622 220 214 251 250 181 184 212 144 151 150 179 138 63 55 43 43 38 38 40 29 30 30 2,572 1,846 611 583 520 506 501 495 511 325 336 338 NA NA 2 4 5 5 6 6 6 6 6 6 NA NA 107 102 101 117 114 106 109 81 83 84 371 273 278 271 276 278 334 313 287 454 468 488 456 432 408 387 370 354 337 321 304 287 274 256 209 257 304 328 331 333 335 337 339 341 337 332 569 85237,73624,53624,23323,95824,32825,61922,76520,22020,25320,307

7,555 7,01341,32327,75327,34527,09827,36428,60825,82022,85722,91022,8921999 2000 2001 2002 2003 2004 2005 2006 2007 2008

723 687 696 620 622 625 627 596 565 534 317 320 330 339 343 346 350 343 337 330 421 465 467 491 482 473 464 465 465 466 54 55 57 40 38 37 36 37 38 39 136 140 148 81 82 83 83 81 79 78 38 38 39 25 26 27 28 27 25 24 365 378 394 976 987 998 1,009 995 981 967 17 17 18 8 8 8 8 8 8 8 83 84 88 60 59 58 58 58 57 57 468 362 363 289 289 289 289 289 289 288 241 230 212 203 200 196 193 186 178 171 336 322 317 311 322 334 345 331 318 304 20,18620,65020,58117,88317,80917,73617,66215,622 13,581 11,540

23,38523,74823,71021,32621,26721,21021,15219,038 16,921 14,806Particulate Matter 2.5 Micrometers in Diameter and Smaller (PM2.5)

National Emission Trends, without Condensables (thousands short tons)

Source Category 1990 1991 1992 FUEL COMB. ELEC. UTIL. 121 105 106 FUEL COMB. INDUSTRIAL 177 151 159 FUEL COMB. OTHER 611 638 662 CHEMICAL & ALLIED PRODUCT MFG 47 43 45 METALS PROCESSING 157 197 198 PETROLEUM & RELATED INDUSTRIES 27 24 24 OTHER INDUSTRIAL PROCESSES 284 264 259 SOLVENT UTILIZATION 4 4 5 STORAGE & TRANSPORT 42 42 50 WASTE DISPOSAL & RECYCLING 234 238 239 HIGHWAY VEHICLES 323 308 292 OFF-HIGHWAY 300 303 305 MISCELLANEOUS 5,233 5,0034,854

TOTAL 7,560 7,320 7,1981993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004

112 108 107 157 161 130 125 126 145 117 116 116 172 183 203 152 148 147 149 151 157 117 109 102 568 550 589 356 356 354 396 439 441 54 53 53 41 49 42 39 39 40 27 28 29 26 23 20 125 125 134 101 106 105 44 46 48 40 32 24 22 22 22 17 17 17 18 18 18 16 13 10 260 256 256 180 186 189 162 168 175 256 247 237 6 6 5 5 5 5 17 17 17 5 4 3 46 43 42 30 31 31 27 28 29 18 16 15 288 271 247 427 439 459 439 333 333 219 218 216 276 261 245 229 216 199 184 173 157 148 144 140 307 309 311 313 309 304 307 295 290 291 302 313 4,926 5,3594,726 4,721 4,244 4,280 4,504 4,681 4,382 1,795 1,795 1,795

7,149 7,542 6,929 6,727 6,257 6,260 6,399 6,503 6,221 3,102 3,072 3,0442005 2006 2007 2008

115 80 45 10 94 88 82 75 52 52 52 51 17 17 17 17 16 13 10 8 7 6 5 3 227 216 206 195 2 2 2 2 13 12 11 10 215 216 216 217 136 128 119 110 324 310 297 283 1,795 1,686 1,577 1,468

3,013 2,826 2,639 2,449Particulate Matter 2.5 Micrometers in Diameter and Smaller (PM2.5)

National Emission Trends, with Condensable from 1999 forward (thousands short tons)

Source Category 1990 FUEL COMB. ELEC. UTIL. 121 FUEL COMB. INDUSTRIAL 177 FUEL COMB. OTHER 611 CHEMICAL & ALLIED PRODUCT MFG 47 METALS PROCESSING 157 PETROLEUM & RELATED INDUSTRIES 27 OTHER INDUSTRIAL PROCESSES 284 SOLVENT UTILIZATION 4 STORAGE & TRANSPORT 42 WASTE DISPOSAL & RECYCLING 234 HIGHWAY VEHICLES 323 OFF-HIGHWAY 300 MISCELLANEOUS 5,233

TOTAL 7,5601991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002

105 106 112 108 107 157 161 130 621 587 584 506 151 159 172 183 203 152 148 147 258 260 267 178 638 662 568 550 589 356 356 354 400 447 449 445 43 45 41 49 42 39 39 40 45 46 47 30 197 198 125 125 134 101 106 105 115 118 125 54 24 24 22 22 22 17 17 17 27 27 28 18 264 259 260 256 256 180 186 189 245 254 264 354 4 5 6 6 5 5 5 5 17 17 17 7 42 50 46 43 42 30 31 31 41 42 44 23 238 239 288 271 247 427 439 459 440 333 334 268 308 292 276 261 245 229 216 199 184 173 157 148 303 305 307 309 311 313 309 304 307 295 290 291 5,0034,854 4,926 5,3594,726 4,721 4,244 4,280 4,511 4,6884,390 3,256

7,320 7,198 7,149 7,542 6,929 6,727 6,257 6,260 7,211 7,287 6,996 5,5782003 2004 2005 2006 2007 2008

509 513 516 480 445 410 183 189 194 188 182 175 437 429 422 421 421 421 30 29 29 29 29 29 56 58 60 58 55 52 19 20 21 20 18 17 365 376 387 377 366 355 7 7 7 7 7 7 24 24 25 24 23 22 267 267 266 266 267 267 144 140 136 128 119 110 302 313 324 310 297 283 3,194 3,131 3,069 2,960 2,851 2,742

5,537 5,496 5,456 5,268 5,080 4,890Sulfur Dioxide (SO2)

National Emission Trends (thousands short tons)

Source Category 1970 1975 1980 1985 1990 1991 FUEL COMB. ELEC. UTIL. 17,39818,26817,46916,27215,90915,784 FUEL COMB. INDUSTRIAL 4,568 3,310 2,951 3,169 3,550 3,256 FUEL COMB. OTHER 1,490 1,082 971 579 831 755 CHEMICAL & ALLIED PRODUCT MFG 591 367 280 456 297 280 METALS PROCESSING 4,775 2,849 1,842 1,042 726 612 PETROLEUM & RELATED INDUSTRIES 881 727 734 505 430 378 OTHER INDUSTRIAL PROCESSES 846 740 918 425 399 396 SOLVENT UTILIZATION NA NA NA 1 0 0 STORAGE & TRANSPORT NA NA NA 4 7 10 WASTE DISPOSAL & RECYCLING 8 46 33 34 42 44 HIGHWAY VEHICLES 273 334 394 455 503 469 OFF-HIGHWAY 278 301 323 354 371 379 MISCELLANEOUS 110 20 11 11 12 11

TOTAL 31,21828,04425,92623,30723,07722,3741992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003

15,41615,18914,88912,08012,76713,19513,41612,58311,39610,85010,43610,425 3,292 3,284 3,218 3,357 2,849 2,805 2,740 2,135 2,139 2,243 1,786 1,769 784 772 780 793 636 648 586 620 628 642 579 580 278 269 275 286 255 259 261 325 338 342 259 257 615 603 562 530 389 407 405 304 313 332 213 200 416 383 379 369 335 344 342 312 316 319 257 237 396 392 398 403 386 409 415 382 410 429 325 337 1 1 1 1 1 1 1 1 1 1 0 0 9 5 2 2 5 5 5 6 6 7 5 4 44 71 59 47 32 33 34 34 34 35 26 27 436 402 369 335 302 304 300 300 260 248 245 212 385 392 399 406 413 422 432 475 437 440 508 617 10 10 15 10 15 7 6 67 70 44 135 132

22,08221,77321,34618,61918,38518,83918,94317,54416,34815,93214,77414,7972004 2005 2006 2007 2008

10,41510,404 9,404 8,941 7,552 1,752 1,735 1,713 1,692 1,670 581 582 580 579 578 254 251 253 254 255 187 175 184 194 203 218 199 201 203 206 349 361 350 340 329 0 0 0 0 0 3 3 3 4 4 28 28 28 28 27 179 146 119 91 64 725 834 708 582 456 129 126 112 98 85

14,82014,84413,655 13,006 11,429Volatile Organic Compounds (VOC)

National Emission Trends (thousands short tons)

Source Category 1970 1975 1980 1985 1990 1991 FUEL COMB. ELEC. UTIL. 30 40 45 32 47 44 FUEL COMB. INDUSTRIAL 150 150 157 134 182 196 FUEL COMB. OTHER 541 470 848 1,403 776 835 CHEMICAL & ALLIED PRODUCT MFG 1,341 1,351 1,595 881 634 710 METALS PROCESSING 394 336 273 76 122 123 PETROLEUM & RELATED INDUSTRIES 1,194 1,342 1,440 703 611 640 OTHER INDUSTRIAL PROCESSES 270 235 237 390 401 391 SOLVENT UTILIZATION 7,174 5,651 6,584 5,699 5,750 5,782 STORAGE & TRANSPORT 1,954 2,181 1,975 1,747 1,490 1,532 WASTE DISPOSAL & RECYCLING 1,984 984 758 979 986 999 HIGHWAY VEHICLES 16,91015,39213,86912,354 9,388 8,860 OFF-HIGHWAY 1,616 1,917 2,192 2,439 2,662 2,709 MISCELLANEOUS 1,101 716 1,134 566 1,059 756

TOTAL 34,65930,76531,10727,40324,10823,5771992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003

44 45 45 44 50 52 56 54 62 61 49 49 187 186 196 206 179 175 174 172 173 176 152 146 884 762 748 823 893 893 889 919 949 950 1,523 1,211 715 701 691 660 388 388 394 251 254 262 249 245 124 124 126 125 73 78 78 66 67 71 46 47 632 649 647 642 477 487 485 457 428 441 601 588 414 442 438 450 435 438 443 438 454 420 442 447 5,901 6,016 6,162 6,183 5,477 5,621 5,149 5,036 4,831 5,012 4,2784,267 1,583 1,600 1,629 1,652 1,294 1,328 1,327 1,237 1,176 1,192 1,484 1,470 1,010 1,046 1,046 1,067 509 518 535 487 415 420 395 394 8,332 7,804 7,277 6,749 6,221 5,985 5,859 5,681 5,3254,952 4,9174,649 2,754 2,799 2,845 2,890 2,935 2,752 2,673 2,682 2,644 2,622 3,057 2,994 486 556 720 551 1,941 816 718 791 733 533 3,970 3,970

23,06622,73022,57022,04220,87219,53118,78018,27117,51117,11221,16320,4772004 2005 2006 2007 2008

49 48 49 50 50 139 133 132 131 130 900 589 816 1,042 1,269 240 235 233 231 228 48 49 48 47 46 575 562 562 561 561 452 457 439 422 404 4,256 4,2454,239 4,232 4,226 1,456 1,442 1,396 1,349 1,303 393 392 386 380 374 4,381 4,112 3,881 3,650 3,418 2,930 2,866 2,773 2,679 2,586 3,970 3,291 2,638 1,985 1,332

19,78918,42117,592 16,759 15,927