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Interim target (IT) levels
Three interim target levels were set by the WHO for attaining their air quality guideline of an annual average fine particulate matter (PM2.5) concentration of 10 µg/m3. Set at progressively lower concentrations: IT-1, 35 µg/m3; IT-2, 25 µg/m3; and IT-3, 15 µg/m3.
Ischemic heart disease
Ischemic heart diseases refer to heart problems caused by narrowed heart arteries. When arteries are narrowed, less blood and oxygen reach the heart muscle. Also called coronary artery disease and coronary heart disease, ischemic heart diseases can ultimately lead to a heart attack.