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Despite this, several tests have been run. [100] [101] [102] Its high octane rating of 120 [103] and low flame temperature [104] allows the use of high compression ratios without a penalty of high NO x production. Since ammonia contains no carbon, its combustion cannot produce carbon dioxide, carbon monoxide, hydrocarbons, or soot.
High levels of lead in the blood is associated with attention deficits, [230] while arsenic poisoning has a negative effect on both verbal IQ and on total intelligence quotient. [230] Manganese poisoning due to levels in drinking water is also associated with a reduced IQ of 6.2 points between the highest and lowest level of poisoning. [231]