Table: air_quality_standards
Columns: pollutant
type
standard
averaging_time
regulatory_citation

Question: what is the averaging time when the regulatory citation is 40 cfr 50.4(b)?
SQL: SELECT "averaging_time" FROM air_quality_standards WHERE "regulatory_citation" = '40 cfr 50.4(b)'

Question: what is the regulatory citation when the standard is 15 μg/m³?
SQL: SELECT "regulatory_citation" FROM air_quality_standards WHERE "standard" = '15 μg/m³'

Question: what is the standard when the pollutant is o 3 and averaging time is 8-hour?
SQL: SELECT "standard" FROM air_quality_standards WHERE "pollutant" = 'o 3' AND "averaging_time" = '8-hour'

Question: what is the polluntant when the regulatory citation is 40 cfr 50.7(a) and the type is primary?
SQL: SELECT "pollutant" FROM air_quality_standards WHERE "regulatory_citation" = '40 cfr 50.7(a)' AND "type" = 'primary'

Question: what is the type when the averaging time is 1-hour and the standard is 0.12 ppm (235 μg/m³)?
SQL: SELECT "type" FROM air_quality_standards WHERE "averaging_time" = '1-hour' AND "standard" = '0.12 ppm (235 μg/m³)'

Question: what is the type when the regulatory citation is 40 cfr 50.9(a)?
SQL: SELECT "type" FROM air_quality_standards WHERE "regulatory_citation" = '40 cfr 50.9(a)'