Additionally, in 2011 China set standards requiring that companies recycle at least 98.5 percent of their silicon tetrachloride waste. It's fairly easy and cos

Additionally, in 2011 China set standards requiring that companies recycle at least 98.5 percent of their silicon tetrachloride waste. It's fairly easy and cost effective to recycle once you have the infrastructure in place. It seems most of the pollution reports are from before the mandate and also when precursors were way cheaper relative to the final product.