PM2.5 Open Data Portal vs PVWatts

The LASS PM2.5 Open Data Portal aggregates readings from Taiwan's low-cost civic air-quality sensor networks (AirBox, LASS, EPA, and others) into freely downloadable JSON snapshots, refreshed continuously with no key required. It also runs a DCF (Data Calibration Framework) service that publishes machine-learning-corrected PM2.5 estimates per monitoring site.

PVWatts estimates the energy production and cost of grid-connected photovoltaic systems anywhere in the world, given basic system specs like capacity, tilt, and array type. The National Renewable Energy Laboratory's developer portal was renamed to the National Laboratory of the Rockies (NLR) and its host retired on 2026-05-29 — the API itself is unchanged, just served from developer.nlr.gov instead of the old developer.nrel.gov, which no longer resolves.