文：Alex
受到持續高溫的襲擊，美國多地陷入乾旱狀態，10 多個州更出現野火，其中最大的火場位處俄勒岡州，相鄰的加州亦是重災區之一。在大火之下，天空被濃煙覆蓋而變成橙色，在早上及黃昏時分，原本橙色的太陽甚至變成「紅日」，有人更稱聲見到太陽出現粉紅色，感覺非常超現實。
Smoky skies sunset!
— TSchlitt-Photography (@Stormchaser_TS) July 20, 2021
New Haven, Missouri#sunset #mowx #canon #wxtwitter #WildfireSmoke pic.twitter.com/828CxxdjzX
隨著煙霧擴散至中部州份，網民亦在社交媒體上踴躍分享自己拍到的「紅日」照片。當地的氣象專家表示，濃煙將太陽光中較短波長的光散射，讓太陽光只餘下主要的紅光，因而令太陽看起來更接近紅色。氣象專家補充，假如煙霧濃度持續增加，太陽的「顏色」仍會繼續變化，不過空氣質氣也會同時變差。
Sunset in fire season #Alaska #wildfire #midnightsun pic.twitter.com/vlddq17bAw
— April (@April_Monroe_) July 13, 2021
Started out as a fairly normal sunset over Templepatrick but as it got lower it transformed into a big red angry ball... tomorrow's gonna be a scorcher ?#nofilter #sunset@WeatherCee @barrabest @angie_weather @bbcniweather @bbcweather @metoffice @Love_Antrim @LoveBallymena pic.twitter.com/dEhcl5pjom
— Edel Mairs (@EdelMairs) July 21, 2021
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The sun this morning. #smoke #closeup #wildfires #britishcolumbia pic.twitter.com/zC63kqRdr5
— kellyjeanrebar (@kellyjeanrebar) July 13, 2021
they say not to stare at the #sun but with the #smoke In the #Winnipeg #sky I thought I would risk it #nofilter pic.twitter.com/f64U0LyeTu
— I could be that girl ?? (@Hasell_1S2LLs) July 20, 2021
SMOKY SUNRISE! Smoke from wildfires creating a hazy sunrise this morning seen from Gustavus Adolphus College in St. Peter, Minnesota. #Wildfires #Sunrise #MNwx pic.twitter.com/3Gmb3UiFX9
— Mark Tarello (@mark_tarello) July 20, 2021
The Independent Man, high atop the Rhode Island State House, is silhouetted by tonight’s setting sun which is obscured by haze from wildfire smoke in the region. #RIwx pic.twitter.com/Nda0Ya7Arx
— Mike Cohea (@MikeCohea) July 21, 2021
A sunset in Ottawa with crazy hazy wildfire smoke. #wildfiresmoke #nikonnofilter@weathernetwork @NikonUSA @NikonCanada pic.twitter.com/0Dff664PHW
— Michelle Valberg (@michellevalberg) July 20, 2021
