CREATE TABLE table_44966 ("Pollutant" CLOB, "Type" CLOB, "Standard" CLOB, "Averaging Time" CLOB, "Regulatory Citation" CLOB)

what is the regulatory citation when the standard is 15 g/m ?
SELECT "Regulatory Citation" FROM table_44966 WHERE "Standard" = '15 μg/m³'
SELECT "Regulatory Citation" FROM "table_44966" WHERE "Standard" = '15 μg/m³'