No other category of issues has reduced the fun of buying a new home like environmental concerns. It seems that every few years, there is another environmental issue which focuses a huge share of attention away from other things. But the other things do not go away. There are at least two lessons to learn from this:

1) New frightening issues normally fade with time into more routine and manageable concerns.
2) The routine concerns still deserve some attention for proper management.

Management of an environmental concern might best start by dissecting it into
two parts:

1) The health issue; and
2) The economic issue.

First, quantify the health issue by doing the appropriate research or testing. Compare the results to your personal circumstances. Decide if some mitigation or abatement is appropriate.

The economic issue becomes how any necessary action is paid for. Get help from your real estate professional or your lawyer on this.