Specialized air quality instruments captured a spike in lead, chlorine, and bromine pollution during the L.A. wildfires.

Cleanliness is a direct reflection of a country’s environmental commitment and its citizens' well-being. The world’s cleanest countries stand out for their emphasis on sustainability, waste management ...

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Index funds are passive investments. They track an index with the aim of replicating that index’s performance minus expenses. Active funds, meanwhile, are led by managers who choose particular ...