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This document provides an overview of the policy of Health Canada's Pest Management Regulatory Agency in estimating the concentration of pesticides in potential drinking water sources. These estimates are incorporated into aggregate exposure assessments as part of the process of assessing the potential impact of pesticide use on the health of Canadians.

The following policy document is intended to provide guidance and information to the Pest Management Regulatory Agency (PMRA) personnel and decision-makers and to the public. This document describes the processes used by PMRA scientists, in dietary risk assessments (DRA), to quantify the level of food residue exposures to consumers of all ages.

weight, body surface area, inhalation rates, ingestion of dust and soil, and drinking water consumption to ensure consistency of approach. Values that are used are representative of the Canadian general population. Exposure is estimated separately for different age groups because of physiological and psychological differences that may affect exposure.

Health Canada and the University of Windsor collected 24-hour personal, indoor, and outdoor exposure samples for 188 polar and non-polar volatile organic compounds (VOCs). A total of 100 study participants in Windsor, Ontario were followed over two 1-year periods. Sampling took place in 8-week winter and summer periods of 2005 and 2006. In 2005, five consecutive 24-hour VOC sampling measurements were obtained to represent indoor, outdoor, and personal exposure levels.

This Human Health Risk Assessment for Ambient Nitrogen Dioxide (NO2) is a comprehensive review of the most relevant health- and exposure-related science for this air pollutant, prepared by the Air Quality Assessment Section of Health Canada.

This code is accompanied by the Technical Guide for Interpretation and Compliance Assessment of Health Canada's Radiofrequency Exposure Guidelines, to assist users in understanding and assessing the safety of electromagnetic exposures in working and living environments.

This document describes the approach that the Canadian Pest Management Regulatory Agency (PMRA) will use for identifying pesticides that cause common toxic effects by common mechanisms of toxicity.

Some people may be at greater risk of exposure to chemicals and pollutants.

This Human Health Risk Assessment for Ambient Nitrogen Dioxide (NO2) is a comprehensive review of the most relevant health- and exposure-related science for this air pollutant, prepared by the Air Quality Assessment Section of Health Canada.

Everyone is exposed to low levels of lead through food, drinking water, air, dust, soil and some consumer products. But ongoing exposure to lead may be harmful to your health.