[' ', ' ', 'EPA', 'consider', 'amending', 'the', 'Guidelines', 'to', 'accommodate', 'a', 'Group', 'A', 'classification', 'of', 'ETS.', 'Rather', 'than', 'expressing', 'concen', 'about', 'the', 'SAB’s', 'recommendation,', 'your', 'March', '24', 'letter', 'states', 'that', '"the', 'guidelines', 'provide', 'a', 'framework', 'for', 'evaluating', 'many', 'types', 'of', 'information', 'but', 'are', 'not', '@', 'prescription', 'for', 'how', 'specific', 'data', 'sets', 'must', 'be', 'interpreted.', 'On', 'several', 'occasions', 'on', 'completely', 'unrelated', 'issues,', 'SAB', 'panels', 'have', 'noted', 'limitations', 'to', 'the', 'guidelines', 'and', 'made', 'recommendations', 'for', 'improving', 'them."', 'It', 'is,', 'I', 'would', 'submit', 'to', 'you,', 'difficult', 'to', 'avoid', 'the', 'conclusion', 'that', 'what', 'we', 'have', 'here', 'is', 'a', 'direct', 'violation', 'of', 'the', 'admonition', 'in', 'Credible', 'Science', 'that', '"science', 'should', 'never', 'be', 'adjusted', 'to', 'fit', 'policy."', 'In', 'that', 'connection,', 'please', 'provide', 'the', 'following', 'information:', 'On', 'what', 'occasions,', 'and', 'in', 'connection', 'with', 'what', 'issues,', 'have', 'SAB', 'panels', 'in', 'the', 'past', 'proposed', 'to', 'alter', 'the', 'EPA', 'Guidelines', 'for', 'Carcinogenic', 'Risk', 'Assessment', 'in', 'order', 'to', 'accommodate', 'a', 'Group', 'A', 'designation', 'of', 'a', 'substance', 'that', 'otherwise', 'would', 'not', 'have', 'qualified', 'for', 'that', 'designation?', 'What', 'if', 'any', 'changes', 'in', 'EPA’s', 'Guidelines', 'for', 'Carcinogenic', 'Risk', 'Assessment', 'are', 'being', 'considered,', 'what', 'input', 'will', 'be', 'solicited', 'on', 'those', 'changes', 'before', 'they', 'are', 'made,', 'and', 'will', 'such', 'process', 'be', 'concluded', 'before', 'the', 'ETS', 'policy', 'guide', 'and', 'risk', 'assessment', 'are', 'released', 'in', 'final', 'form?', 'Response:', 'These', 'issues', 'were', 'addressed', 'in', 'some', 'detail', 'in', 'a', 'letter', 'to', 'you', 'dated', 'June', '12,', '1992,', 'from', 'Erich', 'Bretthauer,', 'Assistant', 'Administrator', 'for', 'Research', 'and', 'Development.', '(Enclosure', 'F).', 'Mr.', 'Bliley:', 'H.', 'EPA', 'Priorities.', 'Your', 'March', '24', 'letter', 'states', 'that', 'since', 'EPA', 'does', 'not', 'have', 'regulatory', 'authority', 'with', 'respect', 'to', 'indoor', 'air', 'issues,', 'EPA', 'was', 'under', 'no', 'obligation', 'to', 'prepare', 'a', 'risk', 'assessment', 'on', 'ETS.', 'Your', 'letter', 'also', 'states', 'that', 'EPA', 'is', '"not', 'attempting', 'in', 'any', 'way', 'to', 'attribute', 'the', 'bulk', 'of', 'indoor', 'air', 'complaints', 'in', 'buildings', 'to', 'environmental', 'tobacco', 'smoke,', 'given', 'the', 'multi-factorial', 'nature', 'of', 'most', 'building', 'problems', '*', '*', '*."', 'You', 'nonetheless', 'go', 'on', 'to', 'assert', 'that', 'workplace', 'smoking', 'bans', 'are', 'justified', 'because', 'ETS', '"is', 'the', 'dominant', 'source', 'of', 'particles,', '*', '*', '*', 'contributes', 'significant', 'gaseous', 'contaminants', 'to', 'the', 'indoor', 'environment"', 'and', 'has', 'been', 'found', 'by', 'the', 'Surgeon', 'General', 'and', 'a', 'panel', 'of', 'the', 'National', 'Research', 'Council/National', 'Academy', 'of', 'Sciences,', 'in', 'reports', 'issued', 'in', '1986,', 'to', 'be', 'a', 'cause', 'of', 'adverse', 'health', 'effects.', 'The', 'monograph', 'published', 'recently', 'by', 'researchers', 'at', 'Oak', 'Ridge', 'National', 'Laboratory', 'entitled', '.', 'vir', '-', 'Compositi', 'Measur', '(1992)', 'does', 'not', 'support', 'the', 'assertion', 'that', 'ETS', 'is', 'the', '"dominant"', 'indoor', 'source', 'of', 'respirable', 'suspended', 'particulates', '(e.g.,', 'pp.', '111-130)', 'or', 'contributes', 'significant', 'amounts', 'of', 'gaseous', 'contaminants', 'to', 'the', 'indoor', 'environment', '(e.g.', 'pp.', '159-177', ',', '183193,', '197-207,', '211-225).', 'Response:', 'The', 'indoor', 'air', 'program', 'has', 'produced', 'a', 'considerable', 'quantity', 'of', 'information', 'on', 'indoor', 'air', 'pollution', 'problems', 'and', 'goes', 'to', 'considerable', 'lengths', 'to', 'place', 'the', 'various', 'factors', 'affecting', 'indoor', 'air', 'quality', 'in', 'their', 'proper', 'perspective.', 'We', 'have', 'consistently', 'emphasized', 'the', 'importance', 'of', 'adequate', 'ventilation', 'as', 'well', 'as', 'the', 'need', 'to', 'control', 'significant', '11', 'TEce', 'B9ISTS', ' ', ' ']