Luchtmeetnet vs National Grid ESO

Luchtmeetnet is the Dutch national air-quality monitoring network (run by RIVM and partners), publishing measured and forecast pollutant levels from over a hundred stations across the Netherlands. It's a fully open government data feed — no key or registration needed.

This is Great Britain's electricity system operator's open-data portal, publishing generation mix, demand forecasts, and grid balancing datasets. The operator was transferred to public ownership and rebranded the National Energy System Operator (NESO) on 1 October 2024; the old data.nationalgrideso.com host no longer resolves at all, with the same CKAN data portal now living at neso.energy/data-portal. Its real CKAN gateway at api.neso.energy returns Access-Control-Allow-Origin: * on every response, resolving cors unknown -> yes.