Air Quality Advisories UpdateAir Quality Advisories Update<div class="ExternalClass68D3214369D4407DB160AEE41F3F0310"><p>Metro Vancouver has issued two air quality advisories so far this summer – one for smog and one for smoke.</p><p> <strong>Ground Level Ozone Advisory June 27 to 29, 2015</strong></p><p>Metro Vancouver and the Fraser Valley were under an air quality advisory from June 27<sup>th</sup> to 29<sup>th</sup> because of high concentrations of <a href="/services/air-quality/AirQualityPublications/GLOFactsheet.pdf" target="_blank">ground-level ozone</a>, a key component of smog. As <a href="" target="_blank">this video</a> shows, ground-level ozone is not emitted directly into the air, but rather, it is formed when nitrogen oxides and volatile organic compounds react in the air in the presence of sunlight. The highest levels of ground-level ozone generally occur between mid-afternoon and early evening on hot summer days. If you recall temperatures reached the mid-30s during this heat wave.</p><p>In 2014, the Metro Vancouver Board adopted a <a href="/services/air-quality/projects-initiatives/Pages/ground-level-ozone-strategy.aspx" target="_blank"> <em>Regional Ground Level Ozone Strategy</em></a> which builds on our successes to date in addressing peak summertime ozone levels, but also includes actions to improve ozone levels year round. The frequency, severity and duration of ground level ozone advisories has improved significantly since the 1990s. </p><p> <strong>Wildfire Smoke Advisory July 5 to 10, 2015</strong></p><p>In the morning of Sunday, July 5<sup>th</sup>, 2015, smoke from wildfire activity began creeping into our region. At first it was visible high in the atmosphere, but the concentrations of <a href="/services/air-quality/AirQualityPublications/PMFactsheet.pdf" target="_blank">fine particulate matter</a> (PM<sub>2.5</sub>) remained low at ground level. Once our monitoring stations began to measure elevated particulate levels in the afternoon, we called an air quality advisory. Conditions worsened quickly overnight as an inversion trapped smoke near the ground. </p><p>On Monday, July 6<sup>th</sup>, PM<sub>2.5</sub> concentrations became elevated as winds pushed smoke further east and the advisory was extended into the Fraser Valley. On July 8<sup>th</sup> it was updated again to include elevated levels of ground level ozone. The advisory was cancelled on July 10<sup>th</sup>. </p><p>While there were over 180 active fires in the province during the event, it is believed that most of the smoke impacting Metro Vancouver originated from fires in the Sunshine Coast and Sea to Sky regions.</p><p>Metro Vancouver's Air Quality website is an excellent source for information. We saw record level site visits during these events. I encourage you to visit us at <a href="" target="_blank"></a>.</p><p>Satellite images from the <a href="" target="_blank">NASA Worldview</a> show the smoke blanketing the region beginning on July 4<sup>th</sup> and spreading eastwards on the 5<sup>th</sup>.</p><p><img src="/metroupdate/PublishingImages/aq-20150704.jpg" alt="" /><br>Saturday, July 4<sup>th</sup> – Satellite image of southwestern BC showing minimal smoke</p><p><img src="/metroupdate/PublishingImages/aq-20150705.jpg" alt="" /><br>Sunday, July 5<sup>th</sup> – Smoke over Southern Vancouver Island, moving toward Metro Vancouver</p></div>|#9b27e797-ea67-4d3b-98bb-21ce706a4a36;L0|#09b27e797-ea67-4d3b-98bb-21ce706a4a36|Issue 11;GTSet|#d14ffe11-45dc-48fb-8684-ff109cf15a74<div class="ExternalClassB1BB30B63F664F5495D7BE0E17B0C0BD"><p>​Metro Vancouver has issued two air quality advisories so far this summer – one for smog and one for smoke. Most parts of the Province continue to face active fires, high fire hazards, and bans on open fires, and campfires. </p></div>0