Pollution & Treatment Controls companies

14 US-listed companies file under Pollution & Treatment Controls.

The 14 most heavily traded of 14 companies filing under Pollution & Treatment Controls
Company	Files under
CECO CECO ENVIRONMENTAL CORP	Pollution & Treatment Controls
FSS FEDERAL SIGNAL CORP /DE/	Pollution & Treatment Controls
ZWS Zurn Elkay Water Solutions Corp	Pollution & Treatment Controls
ATMU Atmus Filtration Technologies Inc.	Pollution & Treatment Controls
PCT PureCycle Technologies, Inc.	Pollution & Treatment Controls
ERII Energy Recovery, Inc.	Pollution & Treatment Controls
FTEK FUEL TECH, INC.	Pollution & Treatment Controls
ZONE Zone Frontier Inc.	Pollution & Treatment Controls
SCWO 374Water Inc.	Pollution & Treatment Controls
CLIR ClearSign Technologies Corp	Pollution & Treatment Controls
LIQT LIQTECH INTERNATIONAL INC	Pollution & Treatment Controls
CLWT EURO TECH HOLDINGS CO LTD	Pollution & Treatment Controls
TOMZ TOMI Environmental Solutions, Inc.	Pollution & Treatment Controls
CHNR CHINA NATURAL RESOURCES INC	Pollution & Treatment Controls

Industry is as each company files it with the SEC.

Families group the sub-industries a filer can choose between, so Pollution & Treatment Controls covers every variant inside it rather than splitting into a page per variant with two companies on each. The order is by what actually trades, price times volume on the latest stored bar, rather than by market capitalisation: that figure is derived from a filer-supplied share count which is sometimes wrong by orders of magnitude, and a ranking built on it puts those errors at the top.