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The Eaton and Palisades fires likely made polluted soils worse, but soil experts say bioremediation may be an alternative to scraping, especially for gardeners.

Tougher enforcement of those polluting the environment was also called for, with new legislation needed to give Natural Resources Wales powers to issue civil sanctions, such as stop orders and fines.

Water companies have come under fire in recent years for allowing more frequent discharging of sewage spills, polluting rivers and lakes.

Los Angeles, Visalia, Bakersfield, Fresno and San Diego were among the list of cities most polluted by ozone.

The city’s growth has far outpaced the existing sewage treatment plants, and inadequate and broken facilities spew waste into the river, polluting the water and air in Imperial Beach and other communities near the border.