Multiple fires were ablaze at once in parts of California and Oregon in early September 2020. Here's how those wildfires can diminish air quality. Read more: https://wapo.st/33xJBK6. Subscribe to The Washington Post on YouTube: https://wapo.st/2QOdcqK Follow us: Twitter: https://twitter.com/washingtonpost Instagram: https://www.instagram.com/washingtonpost/ Facebook: https://www.facebook.com/washingtonpost/