The Zacks Pollution Control industry has been benefiting from rise in pollution-related health concerns, efforts to adhere to pollution-related national and international norms by industries, and urbanization in several countries. Healthy shale drilling activities and increase in economic activities are expected to prove beneficial for the industry. Industry players like Donaldson Company, Inc. DCI, Tetra Tech, Inc. TTEK, Energy Recovery, Inc. ERII and Heritage-Crystal Clean, Inc. HCCI are poised to capitalize on the opportunities. However, increasing preference for alternative fuels and high costs related to frequent upgrade of products have marred the outlook of the industry players. Time to Invest in Legal Marijuana If you’re looking for big gains, there couldn’t be a better time to get in on a young industry primed to skyrocket from $17.7 billion back in 2019 to an expected $73.6 billion by 2027. After a clean sweep of 6 election referendums in 5 states, pot is now legal in 36 states plus D.C. Federal legalization is expected soon and that could be a still greater bonanza for investors. Even before the latest wave of legalization, Zacks Investment Research has recommended pot stocks that have shot up as high as +285.9%. You’re invited to check out Zacks’ Marijuana Moneymakers: An Investor’s Guide. It features a timely Watch List of pot stocks and ETFs with exceptional growth potential.Today, Download Marijuana Moneymakers FREE >>Want the latest recommendations from Zacks Investment Research? Today, you can download 7 Best Stocks for the Next 30 Days. Click to get this free report Donaldson Company, Inc. (DCI): Free Stock Analysis Report Tetra Tech, Inc. (TTEK): Free Stock Analysis Report Energy Recovery, Inc. (ERII): Free Stock Analysis Report HeritageCrystal Clean, Inc. (HCCI): Free Stock Analysis Report To read this article on Zacks.com click here. Zacks Investment Research