California Speedway President Bill Miller announced the postponement and said officials are reviewing potential dates for rescheduling the race.
"It is never easy to make a decision like this, but the bottom line is safety -- the safety of the guests and the competitors," Miller said in a statement.
According to Miller, officials have been monitoring the situation since one of two wildfires began last week some five miles from the track.
"As the fires have continued to spread, several issues were considered for us to arrive at this decision, including the proximity of the fire, the air quality, transportation issues and staffing requirements," he said.
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