The data comes from a Monitoring Station located within the Tsay Keh Dene community. This station is about 450 metres from the edge of Tsay Keh Dene Beach and operates year-round to provide long-term air quality data.

Particulate Matter (PM) refers to tiny particles suspended in the air. PM_2.5 are fine particles with a diameter of 2.5 micrometres (µm) or less, and PM₁₀ includes particles with a diameter of 10 micrometers or less. For comparison, a human hair is about 50-70 µm thick. Because of their small size, these particles can be inhaled deep into the lungs.

The main goal is to monitor fugitive dust from the exposed sediment beaches of the Williston Reservoir, which occurs when water levels are low. Under windy conditions, this dust can create storms that travel into the Tsay Keh Dene community. The data helps evaluate the effectiveness of the Williston Dust Mitigation Program (WDMP), which works to reduce these dust emissions.

The red dashed lines represent 24-hour air quality guidelines.

• For PM_2.5, the line at 27 µg/m³ is the Canadian Ambient Air Quality Standard (CAAQS).
• For PM₁₀, the line at 50 µg/m³ is the BC Air Quality Objective (AQO).

Important: These standards are based on a 24-hour average. This dashboard shows hourly data, so short spikes above the line do not necessarily mean the 24-hour standard has been exceeded.

The Air Quality Monitoring Program is conducted by Chu Cho Environmental as a component of the WDMP on behalf of Tsay Keh Dene Nation with funding from BC Hydro.