4 ms·
I don't understand the coloring of the image. It looks like there's a huge range in color from 25-50, but 50-100 and 100-150 look almost the same.
by mysterydip 3y ago
I don't understand the coloring of the image. It looks like there's a huge range in color from 25-50, but 50-100 and 100-150 look almost the same.
- KirillPanov 3y agoBecause 25-50 ppb is the range where it starts to affect human health.