| Summary | p. XVII |
| Introduction | p. 1 |
| Methodological Foundations of Defining Environmental Standards | p. 5 |
| Environmental Standards and Human Attitudes to Nature | p. 5 |
| Environmental Standards as Cultural Achievements | p. 6 |
| Setting Limit Values as a Rational Process | p. 10 |
| Pragmatic Consistency and Practical Generalizability | p. 14 |
| Methodological Problems of Establishing Limit Values | p. 18 |
| The Effect Principle | p. 18 |
| Natural Exposures | p. 23 |
| Combined Effects | p. 25 |
| Environmental Policy | p. 28 |
| The Risk Concept as a Fundamental Concept of Environmental Policy | p. 28 |
| Principles of Environmental Policy | p. 31 |
| Instruments of Environmental Policy | p. 34 |
| Literature | p. 35 |
| Scientific and Medical Foundations | p. 39 |
| Possible Principles of Interaction between two Noxae, especially with the Involvement of Ionizing Radiation | p. 41 |
| Dose-Response Relationships and Models for Combined Effects | p. 41 |
| Dose-Response Curves and Mechanisms | p. 41 |
| Reversible Effect Mechanisms | p. 43 |
| Irreversible Mechanisms | p. 45 |
| Mutagenic Effects | p. 46 |
| Tumours | p. 48 |
| Dose-Response Curves in the Lower Dose Range | p. 50 |
| Differentiation between Stochastic and Non-stochastic Effects | p. 54 |
| Conclusions | p. 55 |
| Combined Effects | p. 56 |
| Terminology | p. 56 |
| Comparison with Single Effects: Synergism and Antagonism | p. 56 |
| Comparison with Models | p. 57 |
| Toxicokinetic and Toxicodynamic Interactions | p. 58 |
| Representation of Combined Effects | p. 58 |
| Models for Combined Effects | p. 60 |
| The Importance of the Independence Model | p. 65 |
| Independent Effects of Different Kinds | p. 66 |
| Combinations of Stochastic Effects | p. 66 |
| Combinations of Non-stochastic Effects | p. 68 |
| Non-mechanistic Models | p. 71 |
| Dose Additivity for Agents Behaving Differently | p. 74 |
| Stochastic and Non-stochastic Effects in Combination | p. 74 |
| Non-stochastic Multiple Combinations | p. 75 |
| Stochastic Multiple Combinations | p. 77 |
| Stochastic and Non-stochastic Multiple Combinations | p. 77 |
| Examples of Empirical Combined Effects | p. 78 |
| Interactions between Medicinal Drugs: Mechanisms, Extent and Incidence | p. 78 |
| Dose-Response Analyses | p. 79 |
| Effect Amplification in the Lower Dose Range? | p. 85 |
| Reduction of a Threshold Dose of A in the Presence of B? | p. 86 |
| Slope Values of Dose-Response Curvesand their Impact on Amplification Effect in Combination | p. 89 |
| Conclusions | p. 89 |
| Literature | p. 91 |
| Combined Exposure to Radiation and Substances | p. 94 |
| Biological Effects of Ionizing Radiation | p. 94 |
| Overview | p. 94 |
| The Induction of Malignant Diseases | p. 95 |
| Extrapolations | p. 98 |
| Radiation Protection | p. 99 |
| Radiation Dose Units | p. 99 |
| Radiation Exposure of the Population | p. 100 |
| Dose Limits | p. 102 |
| Interactions between Ionizing Radiation and Chemicals | p. 103 |
| Basic Considerations on Estimating Combined Effects | p. 103 |
| Exemplary Discussion of Combined Effects | p. 105 |
| Summary Assessment and Recommendations for Action | p. 133 |
| Literature | p. 141 |
| Combined Exposure to Chemical Substances | p. 147 |
| Introduction | p. 147 |
| The Categorical Heterogeneity of Limit Values | p. 148 |
| Problems concerning "Safety Margins" | p. 148 |
| Toxicological Systematics of Combined Exposures | p. 150 |
| Present Knowledge on Combined Effects | p. 152 |
| Conventionally Toxic Effects | p. 153 |
| A Complex, mostly Indefinite Mixture: Love Canal | p. 154 |
| A Complex, Definite Mixture: Contaminations in Drinking Water | p. 157 |
| Conclusions | p. 159 |
| Hypotheses on Combined Effects in the Range of "Effect Thresholds" | p. 159 |
| Difficulties of Finding Limit Values for Combined Exposures | p. 159 |
| Findings Supporting the Hypotheses | p. 161 |
| Further Experiments Supporting the Hypotheses | p. 169 |
| Apparent Conflicts with the Hypotheses | p. 172 |
| Summary and Assessment | p. 179 |
| Appendix | p. 181 |
| Literature | p. 182 |
| Combined Exposure to Cancerogenic Substances | p. 183 |
| Attack Sites and Factors of Influence | p. 184 |
| Establishing the Cancerogenic Properties of Chemical Substances: Epidemiology vs. Experiment | p. 187 |
| Results from Epidemiological Studies | p. 188 |
| Animal Experiments | p. 193 |
| Summary Assessment and Recommendations for Action | p. 210 |
| Appendix | p. 212 |
| Literature | p. 215 |
| Quantitative Relationships between Mixed Exposures and Effects on Plants | p. 217 |
| Introduction | p. 217 |
| Establishing Dose-Response Relationships and Evaluating Guideline Values for Single Components | p. 218 |
| The Relationship between Exposure and Effect | p. 218 |
| The Present Situation Concerning Immissions of Effects | p. 219 |
| Protected Assets | p. 221 |
| Criteria for the Detection and Assessment of Effects | p. 222 |
| Assessment of the Results regarding their Relevance for Determining Dose-Response Relationships | p. 223 |
| Evaluation of the Guideline Values for Single Components | p. 226 |
| Prospects for the Appraisal of the Hazard Potential of Mixed Exposures | p. 239 |
| Examples of Combined Effects | p. 240 |
| Models for Dose-Response Relationships in Combined Exposure | p. 247 |
| Filtered-Unfiltered Experiments | p. 253 |
| Possible Interactions | p. 254 |
| Summary Assessment and Recommendations for Action | p. 256 |
| Literatur | p. 259 |
| Perception of Technical Risks | p. 265 |
| Foreword | p. 265 |
| Current Risk Debate | p. 266 |
| Risk Perception Models | p. 269 |
| Semantic Risk Model | p. 269 |
| Risk as an Early Warning Indicator | p. 273 |
| Intuitive Processes of Risk Perception | p. 274 |
| The Media as a Source of Information | p. 278 |
| Perception of Combined Effects | p. 280 |
| Psychosomatic Links | p. 284 |
| Duties of Risk Policy | p. 286 |
| Conclusions | p. 289 |
| Literature | p. 292 |
| The Importance of Economic Factors in Setting Combined Environmental Standards | p. 297 |
| Scope | p. 297 |
| Cost-effective Environmental Protection with Adequate Information | p. 299 |
| Adverse Effects | p. 299 |
| Abatement Costs | p. 301 |
| Cost-efficient Limit Values | p. 302 |
| An Empirical Example | p. 306 |
| Choice of Policy Instruments | p. 307 |
| Cost-efficient Limit Values under Imperfect Information | p. 310 |
| Uncertainty in Decision-making | p. 310 |
| Stochastic Decision Model | p. 312 |
| Fuzzy Decision Model | p. 314 |
| Decision Models Subject to Uncertainty | p. 316 |
| Conclusions | p. 317 |
| Literature | p. 318 |
| Legal Problems of Assessing and Regulating Exposure to Combined Effects of Substances and Radiation | p. 321 |
| The Current Legal Situation | p. 321 |
| Constitutional Duties of Protection | p. 321 |
| Environment Protection Law | p. 322 |
| General | p. 322 |
| Laws Relating to Environmental Media | p. 323 |
| Chemicals Law | p. 325 |
| Secondary Legislation | p. 327 |
| General | p. 327 |
| Limits | p. 327 |
| Action Thresholds Giving Rise to Legal Obligations | p. 332 |
| Classification of Mixtures and Preparations | p. 334 |
| Imputation of Combined Effects | p. 338 |
| Civil Liability Law | p. 338 |
| Welfare Law Pertaining to Occupational Health and Safety | p. 341 |
| Public Law | p. 342 |
| Lifestyle-based Substance Risk | p. 345 |
| The Situation in Other Countries | p. 346 |
| USA | p. 346 |
| Switzerland | p. 349 |
| Netherlands | p. 350 |
| Appraisal | p. 352 |
| Constitutional Foundations | p. 352 |
| Summary Appraisal of the Current Legal Situation and Reform Needs | p. 354 |
| Reform Proposals I: Assessment of Combined Effects | p. 356 |
| Testing of New Substances | p. 356 |
| Testing of Existing Substances | p. 357 |
| Classification | p. 357 |
| Research Obligations | p. 357 |
| Conclusions | p. 358 |
| Reform Proposals II: Regulation | p. 359 |
| General | p. 359 |
| Limits to the Law in Regulating Combined Effects | p. 359 |
| Prevention of Dangers and Precaution Against Hazards | p. 360 |
| Environmental Quality, Emission Limits and Minimization | p. 363 |
| Conclusions | p. 364 |
| Regulatory Strategies for Combined Effects | p. 364 |
| Limits to the Regulatory Coverage of (Possible) Combined Effects | p. 364 |
| Regulatory Strategies | p. 365 |
| Case-wise Risk Assessment | p. 366 |
| Safety Margins | p. 367 |
| Dominant Components | p. 368 |
| Limits for Combined Effects | p. 368 |
| Emission Restrictions and Minimization | p. 370 |
| Policy Addressees (Imputation Models) | p. 372 |
| Basic Imputation Models | p. 372 |
| Voluntary Model | p. 372 |
| Quota Model | p. 373 |
| Priority Principle | p. 374 |
| Remediation Model | p. 375 |
| Dominant Component Model | p. 375 |
| Compensatory Model | p. 376 |
| General Imputation Principles | p. 376 |
| Relationship between Regulatory and Imputation Models | p. 378 |
| Recommendations | p. 379 |
| Literature | p. 380 |
| Appraisal and Recommendations | p. 387 |
| Summary Appraisal | p. 387 |
| Possible Solutions and Recommendations for Action | p. 393 |
| Glossary | p. 397 |
| Authors | p. 405 |
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