In the 1960s, almost 80% of Lake Acheron was polluted with hazardous contaminants, but after years of restoration and recovery in this lake, many fewer are toxic now.
In the 1960s, almost 80% of Lake Acheron was polluted with hazardous contaminants, but after years of restoration and recovery in this lake, much less is toxic now.
In the 1960s, almost 80% of Lake Acheron was polluted with hazardous contaminants, but after years of restoration and recovery in this lake, many fewer are toxic now.
In the 1960s, almost 80% of Lake Acheron was polluted with hazardous contaminants, but after years of restoration and recovery in this lake, much less is toxic now.
For percents of something we don't count, something for which we would ask "how much?" instead of "how many?", we use "less."