3 ms·
It dropped from 500-600 ng/m3 in the 1980s to 8 ng/m3 in 2018. Current exposure is from old residue attached to soil dust particles.
by ahazred8ta 5y ago
It dropped from 500-600 ng/m3 in the 1980s to 8 ng/m3 in 2018. Current exposure is from old residue attached to soil dust particles.