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- Environmental aspects 40
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- Economic aspects 14
- Government policy 12
- Research 12
- Law and legislation 10
- Environmental policy 9
- Particles 8
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- Atmospheric ozone 6
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- History 4
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- Physiological effect 4
- Aerosols 3
- Analysis 3
- Atmospheric chemistry 3
- Citizen participation 3
- Coal 3
- Greenhouse gases 3
- Ozone-depleting substances 3
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