How many different standards have a PM of 0.02 g/kWh?
CREATE TABLE table_2780146_6 (standard VARCHAR, pm__g_kwh_ VARCHAR)
SELECT COUNT(standard) FROM table_2780146_6 WHERE pm__g_kwh_ = "0.02"
### Context: CREATE TABLE table_2780146_6 (standard VARCHAR, pm__g_kwh_ VARCHAR) ### Question: How many different standards have a PM of 0.02 g/kWh? ### Answer: SELECT COUNT(standard) FROM table_2780146_6 WHERE pm__g_kwh_ = "0.02"