Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_2780146_6 (pm__g_kwh_ VARCHAR, co__g_kwh_ VARCHAR)
### Question:
What's the PM for the standard with 12.3 g/kWh CO?
### Answer:
SELECT pm__g_kwh_ FROM table_2780146_6 WHERE co__g_kwh_ = "12.3"