Scenario 4
The volcano, Mt. Darrio, located in the red nation, erupted without warning today. The clouds of ash have halted all air traffic over the country and the resulting lava flow has caused $300 billion in damage to the surrounding cities. One town, Temacula, was home to a plant that produces Styrofoam. The fire that was ignited by the lava flow caused a massive fire to the structure. Styrofoam gives off hydrocarbons when burned that are known carcinogens (something that causes cancer). The fumes are so dense in the area; relief workers cannot get into the town to help survivors. Prevailing winds will likely carry some of these fumes across the border to the gray nation.

<-- Here are the designs for the Air filter car and the cancer scanner