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Air
2
Air Pollutants
2
Air Pollution
2
Air quality management
2
Coal
2
Environment
2
Environmental policy
2
History
2
History, 19th Century
2
History, 20th Century
2
Pollution
2
Public Health
2
Public health
2
Santé publique
2
Smoke
2
Smoke prevention
2
adverse effects
2
prevention & control
2
BUSINESS & ECONOMICS
1
Environnement
1
Fumée
1
General
1
Gestion
1
HISTORY
1
Histoire
1
Infrastructure
1
Luftföroreningar
1
Lutte contre
1
Medical care
1
Medical policy
1
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1
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2
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3