| Industrial processes | ||||||||
| Petro- | Storage | Waste | ||||||
| Chemical | Metals | leum | Other | Solvent | and | disposal | Total | |
| indus- | pro- | indus- | indus- | utili- | trans- | and | indus- | |
| Year | tries | cessing | tries | tries | zation | port | recycling | trial |
| million tons | ||||||||
| 1940 | 0.330 | 1.208 | 0.366 | 3.996 | na | na | 0.392 | 6.292 |
| 1950 | 0.455 | 1.027 | 0.412 | 6.954 | na | na | 0.505 | 9.353 |
| 1960 | 0.309 | 1.026 | 0.689 | 7.211 | na | na | 0.764 | 9.999 |
| 1970 | 0.235 | 1.316 | 0.286 | 5.832 | na | na | 0.999 | 8.668 |
| 1980 | 0.148 | 0.622 | 0.138 | 1.846 | na | na | 0.273 | 3.027 |
| 1989 | 0.063 | 0.211 | 0.058 | 0.591 | 0.002 | 0.101 | 0.251 | 1.276 |
| 1990 | 0.077 | 0.214 | 0.055 | 0.583 | 0.004 | 0.102 | 0.271 | 1.306 |
| 1991 | 0.068 | 0.251 | 0.043 | 0.520 | 0.005 | 0.101 | 0.276 | 1.264 |
| 1992 | 0.071 | 0.250 | 0.043 | 0.506 | 0.005 | 0.117 | 0.278 | 1.269 |
| 1993 | 0.066 | 0.181 | 0.038 | 0.501 | 0.006 | 0.114 | 0.334 | 1.240 |
| 1994 | 0.076 | 0.184 | 0.038 | 0.495 | 0.006 | 0.106 | 0.313 | 1.219 |
| 1995 | 0.067 | 0.212 | 0.040 | 0.511 | 0.006 | 0.109 | 0.287 | 1.231 |
| 1996 | 0.063 | 0.164 | 0.032 | 0.327 | 0.006 | 0.090 | 0.304 | 0.985 |
| 1997 | 0.064 | 0.171 | 0.032 | 0.337 | 0.006 | 0.093 | 0.307 | 1.010 |
| 1998 | 0.065 | 0.171 | 0.032 | 0.339 | 0.006 | 0.094 | 0.310 | 1.016 |
| Fuel combustion | Non- | Total | ||||||
| Electric | Indus- | On-road | road | Miscel- | all | |||
| Year | utilities | trial | Other | Total | vehicles | sources | laneous | sources |
| million tons | ||||||||
| 1940 | 0.962 | 0.708 | 2.338 | 4.008 | 0.210 | 2.480 | * | 15.956 |
| 1950 | 1.467 | 0.604 | 1.674 | 3.745 | 0.314 | 1.788 | * | 17.133 |
| 1960 | 2.117 | 0.331 | 1.113 | 3.561 | 0.554 | 0.201 | * | 15.558 |
| 1970 | 1.775 | 0.641 | 0.455 | 2.871 | 0.443 | 0.255 | * | 13.190 |
| 1980 | 0.879 | 0.679 | 0.887 | 2.445 | 0.397 | 0.566 | * | 7.287 |
| 1989 | 0.271 | 0.243 | 0.869 | 1.382 | 0.367 | 0.477 | * | 3.502 |
| 1990 | 0.295 | 0.270 | 0.631 | 1.196 | 0.336 | 0.489 | * | 3.327 |
| 1991 | 0.257 | 0.233 | 0.657 | 1.147 | 0.349 | 0.489 | * | 3.249 |
| 1992 | 0.257 | 0.243 | 0.683 | 1.183 | 0.343 | 0.490 | * | 3.286 |
| 1993 | 0.279 | 0.257 | 0.588 | 1.124 | 0.321 | 0.483 | * | 3.168 |
| 1994 | 0.273 | 0.270 | 0.570 | 1.113 | 0.320 | 0.480 | * | 3.133 |
| 1995 | 0.268 | 0.302 | 0.610 | 1.179 | 0.293 | 0.456 | * | 3.159 |
| 1996 | 0.287 | 0.255 | 0.632 | 1.174 | 0.282 | 0.457 | * | 2.898 |
| 1997 | 0.293 | 0.249 | 0.548 | 1.089 | 0.272 | 0.458 | * | 2.830 |
| 1998 | 0.302 | 0.245 | 0.544 | 1.091 | 0.257 | 0.461 | * | 2.825 |
Source: U.S. Environmental Protection Agency, Office of Air Quality Planning and Standards, National Air Quality and Emissions Trends Report, 1998, Table A-2 (EPA, OAQPS, Research Triangle Park, NC, 2000), and earlier reports in this series.
Notes: PM-10 refers to particulate matter with a diameter 10 micrometers or less. na = not available. *Emissions from miscellaneous and natural sources are reported in Table 5.6. Non-road sources include non-road diesel (e.g., construction and farm) and railroads.
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