Gas Associated With Swimming Pool Smell
This page is the CodyCross answer for the clue below from London, Group 499, Puzzle 5 (Portobello Road Market).
Question is: Gas Associated With Swimming Pool Smell
and the answer is: CHLORINE
Word Meaning:
CHLORINE — A toxic, green, gaseous chemical element (symbol Cl) with an atomic number of 17.
Definitions from Wiktionary.