Strontium carbonate a mineral, strontium carbonate is prepared synthetically in one of two manners. First of which is from naturally occurring celestine also known as strontium sulfate (SrSO) or by using soluble strontium salts by the reaction in solution with a soluble carbonate salt (usually sodium or ammonium carbonates). For example if sodium carbonate was used in solution with strontium nitrate: Sr(NO) + NaCO → SrCO + 2 NaNO . The most common use is as an inexpensive colorant in fireworks. Strontium and its salts emit a brilliant red color in flame. Unlike other strontium salts, the carbonate salt is generally preferred
Volatile organic compound air pollution can still be important for indoor air pollution. California's ARB uses the term "reactive organic gases" (ROG) to measure organic gases after public hearing in September 1995. The ARB revised the definition of "Volatile Organic Compounds" used in the consumer products regulations, based on their committee's findings. Health Canada classifies VOCs as organic compounds that have boiling points roughly in the range of . The emphasis is placed on commonly encountered VOCs that would have an effect on air quality. The European Union defines a VOC as "any organic compound having an initial boiling point less than or