ENUM
Contaminant
link GraphQL Schema definition
1 enum Contaminant { 2 3 # Nitrogen oxides 4 5 6 # Sulfur dioxide 7 8 9 # Nitrogen dioxide 10 11 12 # Carbon monoxide 13 14 15 # Ozone 16 17 18 # Particulate matter 10 19 20 21 # Particulate matter 2.5 22 23 24 # Hydrogen sulfide 25 26 }