Satellite image showing smoke from California wildfires blanketing the state on Aug. 7, 2018. Photo: NASA

The massive wildfires burning in California are emitting so much smoke that parts of the state, as well as neighboring states, now have some of the most hazardous air quality readings of anywhere in the world.

Why it matters: Millions of people not threatened by the flames are still in harms' way of the fires' smoke plumes, particularly in the Central Valley of California. Smoke-related air quality issues are the result of wildfires combined with weather patterns that keep the smoke in place for long periods of time.

Details: The wildfires are belching smoke high into the air, but with anemic winds aloft much of it is getting trapped above the Golden State. The wildfires themselves are historic, and their smoke plumes have been so large and widespread that they've been visible from the International Space Station.

  • The Mendocino Fire Complex, for example, is the state's largest wildfire on record, at more than 290,000 acres burned and growing. The fire is unlikely to be contained — let alone extinguished — before September, according to Cal Fire.

The impact: As they churn through wood, grass and other materials, California's wildfires are wafting both gases and fine particles into the air. When inhaled, the microscopic particles, known as particulates, can be absorbed into the bloodstream and lungs, causing or aggravating health problems such as asthma and heart disease.

  • Smoke can also serve as a precursor to ground-level ozone, which is a human health hazard as well.
  • In some areas, air quality is so hazardous that authorities are advising people to stay indoors as much as possible.

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Trump commutes Roger Stone's sentence

Roger Stone arriving at his sentencing hearing on Feb. 20. Photo: Drew Angerer/Getty Images

President Trump on Friday evening commuted the sentence of his longtime associate Roger Stone, according to two senior administration officials. Stone in February was sentenced to 40 months in prison for crimes including obstruction, witness tampering and making false statements to Congress.

Why it matters: The controversial move brings an abrupt end to the possibility of Stone spending time behind bars. He had been scheduled to report to prison on July 14.

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Which states have set single-day coronavirus records this week

Data: COVID Tracking Project and state health department data compiled by Axios; Map: Danielle Alberti and Naema Ahmed/Axios

13 states this week surpassed records set just last week for their highest number of coronavirus infections in a single day, according to the COVID Tracking Project and state health department data. 16 states in total reported new highs.

The big picture: The United States' alarming rise in coronavirus cases isn't just due to increased testing — particularly where the number of cases has grown fastest over the last month, Axios' Andrew Witherspoon and Caitlin Owens report.

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Illustration: Sarah Grillo/Axios

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