The spill was reported near an unincorporated area of the city, according to the Compton Fire Department.
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Around 1:30 p.m., fire officials said a leak has been capped.
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The incident was reported at an old construction site. Workers were cleaning up and tipped a storage tank, fire officials said.
The Los Angeles County Fire Department Hazmat team was able to upright the tank, isolate and cap the leak.
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Compton Fire said they are waiting for Hazmat to identify the substance. It's not known if the leak was a liquid or gas.
Fire officials said the smell was not dangerous but recommended residents near Compton College stay indoors until the smell dissipates.
No injuries or evacuations were reported.