South America — what's coming

Brazil's SISAGUA national tap-water DB is the second-best per-capita measured dataset in the Americas after EWG. Argentina has provincial coverage (ENOHSa). Chile, Peru, Colombia get geology-based hardness fallback (Andes = mostly soft). CAMS Global Air covers full continent. OpenSky has good receiver density along the Atlantic coast.

Source plan

• Hardness — Brazil SISAGUA + Argentina ENOHSa; geology fallback elsewhere
• Air — CAMS Global + local PurpleAir clusters where available
• 5G — OpenCelliD per-MCC (724 BR, 722 AR, 730 CL, 716 PE, 732 CO, ...)
• Flights — OpenSky + ADS-B Exchange