A man walks along the Redwood highway by the Pacific Ocean coast as smoke from wildfires covers an area near Orick, Calif., Sept. 9, 2020.

The sun sets behind smoke caused by local wildfires in Huntington Beach, Calif., Sept. 9, 2020.

Cars drive along the San Francisco Bay Bridge under an orange smoke filled sky at midday in San Francisco, Sept. 9, 2020.

Cars drive along the San Francisco Bay Bridge under an orange smoke filled sky at midday in San Francisco, Sept. 9, 2020.

The San Francisco Bay Bridge and city skyline are obscured in orange smoke and haze as their seen from Treasure Island in San Francisco, Sept. 9, 2020.

Smoke from various wildfires burning across Northern California mixes with the marine layer, blanketing the San Francisco skyline in darkness and an orange glow, seen from Treasure Island, San Francisco, Sept. 9, 2020.

Under darkened skies from wildfire smoke, a waiter carries a tray of Irish Coffee to people having lunch at the Buena Vista Cafe in San Francisco, Sept. 9, 2020.

People record the darkened Golden Gate Bridge covered with smoke from wildfires Wednesday, Sept. 9, 2020, from a pier at Fort Baker near Sausalito, Calif.

The skyline in the distance behind Oracle Park is partially visible with smoke from wildfires late Wednesday afternoon Sept. 9, 2020, in San Francisco.

Red sky and thick smoke are seen in Salem City, Ore., Sept. 8, 2020.

Under darkened skies from wildfire smoke, a jogger makes his way along McCovey Cove outside Oracle Park on Wednesday, Sept. 9, 2020, in San Francisco.

People stop at Fort Point to take morning pictures of the Golden Gate Bridge covered in smoke from wildfires Wednesday, Sept. 9, 2020, in San Francisco.

Smoke from California wildfires obscures the sky over Oracle Park as the Seattle Mariners take batting practice before their baseball game against the San Francisco Giants on Wednesday, Sept. 9, 2020, in San Francisco.

Visitors are seen in Dolores Park under an orange sky darkened by smoke from California wildfires in San Francisco, Sept. 9, 2020.

The Bay Bridge is seen under an orange sky darkened by the smoke from California wildfires in San Francisco, Sept. 9, 2020.