What level of pollution does cinder block production involve?

Answer 1

there is significant energy that goes into the production

cement-mine limestone, ship it, pulverize it, cook it, pulverize again, add water form it cook it, ship it
aggregate-mine aggregate, ship it, crush it, form it, cook it, ship it

transport block through distribution network
transport it to job site
lay block
fill voids with more cement grout

all of this heating is done by fossil fuels
cooking limestone releases many toxic gasses into environment
mining with fossil fuels
transport with fossil fuels

Answer 2

In fact it is good for the environment ,as it is basic which neutralizes acid rain .