Metro Vancouver upgrades Fraser Valley air warning

Metro Vancouver upgraded its air-quality warning for the eastern Fraser Valley on Thursday as wildfire smoke pushed fine particulate pollution higher across the Lower Fraser Valley airshed. Environment Canada’s alert for Eastern Fraser Valley said the warning was in effect because of elevated PM2.5, or fine particulate matter, from wildfire smoke in British Columbia. The warning told residents to avoid outdoor activities in the hardest-hit area and said conditions could last until the weather changes. ### Which part of the region is under the stronger warning? Environment Canada’s Eastern Fraser Valley alert said the area was under an orange air-quality warning, which it described as a “Very High Health Risk.” The federal alert page said Metro Vancouver Regional District had issued the warning because of elevated fine particulate matter and linked the smoke to wildfires in British Columbia, including fires near Boston Bar and in the Southern Interior. (weather.gc.ca) Metro Vancouver says it issues air-quality warnings for the entire Lower Fraser Valley airshed, including Metro Vancouver and parts of the Fraser Valley Regional District, when pollution levels are unhealthy or expected to become unhealthy. The regional district’s air-quality page says its warnings explain both the cause of the pollution and the steps residents can take to protect their health. (weather.gc.ca) ### What exactly are officials warning people about? The August 4 alert said elevated PM2.5 was the immediate concern. Environment Canada said smoke levels can change quickly with weather and fire behaviour, and warned that conditions may persist until there is a change in weather. Fraser Health says wildfire smoke contains tiny particles that can travel deep into the lungs and bloodstream. (metrovancouver.org) Its wildfire-smoke guidance says breathing smoke can affect everyone’s health, while people at higher risk include infants, children, older adults, pregnant people and people with medical conditions. ### Who is being told to take extra precautions? (weather.gc.ca) Fraser Health says people with respiratory or other medical conditions, children and older adults face higher risks during smoky conditions. Its public guidance tells residents to prepare before and during smoke events and to reduce exposure inside the home when possible. Environment Canada’s alert for Eastern Fraser Valley told residents to limit outdoor activity, reduce the duration and intensity of exertion, and in the highest-risk conditions to avoid outdoor activities. (fraserhealth.ca) The warning reflects the stronger language used when smoke concentrations rise into the highest health-risk category on the regional alert page. ### Where is the smoke coming from? (fraserhealth.ca) The August 4 alert named wildfires in British Columbia as the source, including the complex of fires near Boston Bar and fires in the Southern Interior. CBC also reported that smoke affecting the Lower Mainland was tied to active fires in several parts of the province as heat and haze spread across British Columbia. Metro Vancouver’s wildfire-smoke information page says smoke events can affect the region even when fires are far away. (weather.gc.ca) The agency says residents should be prepared for changing conditions during wildfire season and use indoor air-cleaning measures where available. ### How can residents track whether conditions improve? Metro Vancouver says its current-air-quality page carries information on warnings, advisories and wildfire smoke, while its AirMap displays real-time air-quality and weather data from the Lower Fraser Valley monitoring network. (weather.gc.ca) The network is operated with the Fraser Valley Regional District, Environment and Climate Change Canada and other partners. (metrovancouver.org) Environment Canada’s alert said the warning would remain in place until a change in weather improves conditions. Residents in the eastern Fraser Valley can also check the federal Air Quality Health Index page for updated readings as smoke shifts. (weather.gc.ca) (metrovancouver.org)