TRANSPORTATION ENERGY DATA BOOK: EDITION 20 - Center for ...

I Historically
the transportation sector, highway vehicles in particular, have been a major source of lead emissions in the U.S. Regulatory
action in 1978 required a gradual reduction of the lead content of all gasoline over a period of many years. The transportation sector
accounts for only 13% of lead emissions in 1998.
Table 4.12
National Lead Emission Estimates, 1970-98”
(thousand short tons per year)
Source category 1970 1975 1980 1985 1990 1995 1996 1997 1998
Highway vehicles 171.96 130.21 60.50 18.05 0.42 0.02 0.02 0.02 0.02
Off-highway 9.74 6.13 4.21 0.92 0.78 0.54 0.51 0.50 0.50
Transportation total 181.70 136.34 64.71 18.97 1.20 0.56 0.52 0.52 0.52
Stationary source fuel combustion 10.62 10.35 4.30 0.52 0.50 0.49 0.49 0.49 0.50
Industrial processes 26.36 11.38 3.94 2.53 2.47 2.27 2.27 2.32 2.33
Waste disposal and recycling total 2.20 1.60 1.21 0.87
Total of all sources 220.87 159.66 74.15 22.89
4.98 0.80 3.93 0.60 3.90 0.61 3.95 0.62 3.97 0.62
Source:
U. S. Environmental Protection Agency, National Air Pollutant Emission Trends, 1900-1998,2000, pp. A-34-A-35, and annual.
(Additional resources: www.epa.gov/oar/oaqps)
“The sums of subcategories may not equal due to rounding.
Percent
of total,
1998
0.5%
12.7%
13.1%
12.7%
58.6%
100.0% 15.6%