gases in the air that cause harm to peoples health. Air pollutants are emitted from both natural and human sources. This guide is part of ‘All Our Health’, a resource which helps health and care professionals prevent ill health and promote wellbeing as part of their everyday practice. This information will help frontline health and care staff use their trusted relationships with patients, families, and communities to take action on the health effects of air pollution. 2.3 billion people in the region are exposed to levels of air pollution several times the WHO guideline for safe air. are natural and artificial airborne substances that are introduced into the environment in a concentration sufficient to have a measurable effect on humans, animals, vegetation, or building materials. From a regulatory standpoint of EPA these substances become air pollutants. As part of the regulatory process, the Clean Air Act requires the EPA to issue a criteria document for each pollutant documenting its adverse effects. Regulated pollutants are therefore
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