| MONOXIDE | Carbon ____ , a colourless, odourless, very toxic gas formed from the incomplete combustion of carbon (8) |
| SOOT | Mass of impure carbon particles resulting from the incomplete combustion of hydrocarbons (4) |
| RADON | Short notice Ron on very toxic gas! |
| OZONE | Pungent toxic gas formed from oxygen by electrical discharge or ultraviolet light (5) |
| FOAM | A mass of small bubbles of gas formed on the surface of a liquid (4) |
| IGNITION | The process of starting the combustion of fuel in a vehicle (8) |
| CO | A heavy odorless colorless gas formed during respiration and by the decomposition of organic substan |
| ACID | ____ rain, precipitation containing pollutants from the combustion of fossil fuels (4) |
| WARNING | Aposematic colouration is used as a ___ to predatory fish that the snake should be avoided as it is very toxic |
| VENIN | Return of “Cleveland Indians”, say — very toxic stuff |
| NEBULA | Interstellar cloud of dust/gas, formed after a star explodes (6) |
| EFFECT | The process whereby the Earth heats up in response to a blanketing of atmospheric cloud, dust, carbo |
| IGNESFATUI | Examples of spontaneous combustion of gases which flit over marshy ground, deluding people who follow them (5,5) |
| WILLOTHEWISP | Ignis fatuus, light produced by combustion of marsh-gas (4-1-3-4) |
| LETHAL | All worried about the combination being very toxic (6) |
| ASH | Product of incomplete combustion |
| TIGERMOTH | Mr Woods gets a moment with the incomplete aeroplane (5,4) |
| NITROGEN | ____ dioxide, gas formed when coal or oil is burned at a high temperature (8) |
| OFFSET | Carbon ______ is any activity that compensates for the emission of carbon dioxide or other greenhouse gases by providing for an emission reduction elsewhere (6) |
| BERG | Alban ----, composer of the incomplete opera 'Lulu' (1935) (4) |
