The greatest progress in reducing atmospheric levels of lead pollution resulted from
A)the elimination of leaded gas.
B)the switch from lead to graphite in pencils.
C)the development of new types of batteries that use lithium instead of lead.
D)new types of lead scrubbers on smokestacks that removed lead from the air.

Question

Quizplus · Accepted Answer

The elimination of leaded gas was the most significant factor in reducing lead pollution in the atmosphere. Lead was commonly used as an additive in gasoline to improve engine performance, but it was found to be toxic and dangerous to human health and the environment. The switch to unleaded gasoline in the 1970s and 1980s was a major step forward in reducing lead pollution, and it has led to significant improvements in air quality and public health.

The Greatest Progress in Reducing Atmospheric Levels of Lead Pollution