smog - air pollution by a mixture of smoke and fog smogginess portmanteau, portmanteau word, blend - a new word formed by joining two others and combining their meanings; `smog' is a blend of `smoke' and `fog'; `motel' is a portmanteau word made by combining `motor' and `hotel'; `brunch' is a well-known portmanteau
Ammonia or azane is a compound of nitrogen and hydrogen with the formula NH 3. It is a colourless gas with a characteristic pungent smell. Ammonia contributes significantly to the nutritional needs of terrestrial organisms by serving as a precursor to food and fertilizers.
Na HCO3 is a chemical compound called sodium bicarbonate (IUPAC name: sodium hydrogen carbonate with the formula). It is a white solid that is crystalline but often appears as a fine powder. It has a slightly salty, alkaline taste resembling that of washing soda (sodium carbonate).