Marine vegetation is a viable method of capturing at least a fraction of the carbon dioxide Japan produces
The findings came after two months of inspections across 28 cities in the notoriously smoggy Beijing-Tianjin-Hebei region and other nearby areas, the official Xinhua news agency said.
The inspections found 13,785 companies - or 70.6 per cent of those inspected - violated standards, with problems ranging from excessive emissions to insufficient pollution control equipment.
The government has thrown its weight behind an ambitious "Jing-jin-ji" plan to integrate the three neighbouring cities, in part to alleviate the strain on the capital, Beijing, and relocate heavy industry away from major population hubs.