Charles Ellicott Commentary 2 Chronicles 30:14

"And they arose and took away the altars that were in Jerusalem, and all the altars for incense took they away, and cast them into the brook Kidron." — 2 Chronicles 30:14 (ASV)

Took away the altars. —The altars of burnt offering erected by Ahaz in every corner of the city (2 Chronicles 28:24).

Altars for incense. —Ha-mĕqattĕrôth—literally, the incense-burners. The term occurs here only.

Cast them into the brook Kidron. —See on 2 Chronicles 29:16. Thus the city was purified as well as the Temple.