Another border power plant resolution was approved Tuesday by the county Board of Supervisors, the third in as many months.
County Air Pollution Control District documents dating to September state emissions from the two power plants being built in Mexicali could harm the health of residents on both sides of the border.
Tuesday's resolution, proposed by Supervisor Hank Kuiper, states the board "urges and supports efforts by federal, state and local governments … to formulate an agreement establishing common air quality standards."
"We haven't failed yet, we just haven't found the solution," Kuiper said.
The board has been criticized for not acting sooner in voicing opposition to the plants.
"It's become a campaign issue when it never should have been," El Centro Mayor Larry Grogan said.
Two of the five supervisors are up for re-election in the March 5 primary.
The two plants will import electricity to San Diego County through Imperial County. One of those plants, Intergen Aztec Energy of Boston, will use two turbines that do not meet California air pollution standards.