The Los Angeles mod contains 19 new missions including a bank robbery, hostage situations, airplane hijaking, forest fire and traffic accidents.
It's also possible to play all original missions from Emergency 3. You can find a list with the new missions below. Click on the title of a mission for a picture.

Mission 01: Military prototype plane crashed
Mission 02: Bomb explodes in busy shopping area
Mission 03: Fire in family house
Mission 04: Hostage Situation at Los Angeles Intl. Airport
Mission 05: Road accident
Mission 06: Police chase ends in tragedy
Mission 07: Homicide at downtown district
Mission 08: Drugs gang
Mission 09: Forest-fire is treatening village
Mission 10: Assault on prison bus
Mission 11: Flood after hurricane
Mission 12: Two children overrun by car
Mission 13: Protect the president
Mission 14: Child is missing
Mission 15: Accident on road junction
Mission 16: Hostage situation at Los Angeles bank
Mission 17: Truck crashed into ravine
Mission 18: Fire reported in large office building
Mission 19: Boeing 747 hijacked