Question

Diffusion of entry or exit of small molecules like
a) H20 b) CO2 c) O2 d) B &C are same

Answer 1

Another major provision of the Clean Air Act dealt with toxic air pollutants. The 1990 amendments expanded the number of regulated substances from 7 to 189, set safety standards for factories where toxic chemicals were used or emitted, and required polluters to install the best available pollution control equipment.