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Lead
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7
Air quality management
4
Climatology, Meteorology and Atmosphere
4
Environment
4
Health
4
Economy
3
Gold
3
Minerals
3
Air quality—Standards
2
Beryllium
2
Boundaries
2
Copper
2
Nonferrous metals
2
Pollution
2
Silver
2
Zinc
2
Aluminum
1
Antimony
1
Bituminous Coal (black Coal)
1
Cadmium
1