what is the standard when the pollutant is o 3 and averaging time is 8-hour?
CREATE TABLE "standards" (
  "pollutant" text,
  "type" text,
  "standard" text,
  "averaging_time" text,
  "regulatory_citation" text
);
SELECT "standard" FROM "standards" WHERE "pollutant"='o 3' AND "averaging_time"='8-hour';