ACID-RAIN
CATALYTIC
COMBUSTION
CONVERTER
DESULFURISATION
DIMMING
FOSSIL
GASES
GLOBAL
GREENHOUS
HYDROCARBON
INCOMPLETE
MONOXIDE
NITROGEN
PARTICULATES
POLLUTION
QUICKLIME
SMOG
SULFUR
WARMING
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Try to find all 20 words on this board.
| V | X | C | O | N | V | E | R | T | E | R | H | H | U | N |
| C | I | T | Y | L | A | T | A | C | V | G | G | D | O | M |
| R | I | L | E | T | E | L | P | M | O | C | N | I | H | M |
| R | A | N | O | I | T | U | L | L | O | P | T | I | M | I |
| Q | P | N | I | A | R | - | D | I | C | A | Q | S | X | N |
| E | D | I | X | O | N | O | M | M | S | R | G | E | H | O |
| L | I | S | S | O | F | V | S | I | Y | T | L | S | N | B |
| S | U | O | H | N | E | E | R | G | H | I | O | A | E | R |
| G | N | O | I | T | S | U | B | M | O | C | B | G | G | A |
| N | O | G | T | O | F | C | U | L | K | U | A | S | O | C |
| I | Y | O | L | L | U | X | V | X | B | L | L | X | R | O |
| M | C | M | U | D | G | N | I | M | R | A | W | X | T | R |
| M | O | S | U | L | F | U | R | C | C | T | V | Q | I | D |
| I | E | W | X | M | I | D | T | X | M | E | I | P | N | Y |
| D | Q | U | I | C | K | L | I | M | E | S | C | Y | O | H |
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