Glossary

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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.

International Agency for Research on Cancer (IARC)

The specialized cancer agency of the World Health Organization (WHO). The IARC Monographs Programme brings together international expert working groups to evaluate the scientific evidence on the carcinogenicity of exposures to specific chemicals or agents. For more information, go to the IARC website.

Ischemic heart disease

Ischemic heart diseases refer to heart problems caused by narrowed heart arteries. When arteries are narrowed, less blood and oxygen reaches the heart muscle. Also called coronary artery disease and coronary heart disease, ischemic heart diseases can ultimately lead to heart attack.