### Instruction:

Extract the cause and effect entities from the following sentence:
Gateway shall maintain airborne contaminants below applicable limits for nominal human performance during crewed periods

### Assistant:

KEYWORD: during
CAUSE_1: crewed periods
EFFECT_1: Gateway shall maintain airborne contaminants below applicable limits for nominal human performance
VARIABLE: Gateway
CONDITION: shall maintain airborne contaminants below applicable limits for nominal human performance

