Residents have been urged to keep their windows and doors shut after a blaze at a recycling plant in Brentford .
London Fire Brigade (LFB) said the fire, in Transport Avenue, is likely to be a "protracted incident".
Firefighters were called to the plant at 12.08pm where ten fire engines are at the scene.
Smoke can be seen for miles around and LFB urged residents nearby to keep their doors and windows closed.
LFB station manager, Jerome Kumedzina, who is at the scene, said: "Crews are working hard to get the fire under control.
"This is likely to be a protracted incident though and we would advise people living and working nearby to keep their doors and windows closed as a precaution because of the smoke."
Around 70 firefighters and officers are currently at the scene and LFB said they have taken over 70 emergency calls to the incident.
Crews from Chiswick, Heston, Ealing, Southall, Twickenham and Feltham fire stations are at the scene.
The cause of the fire is unknown at this stage.
Motorists have been facing severe queues due to the fire, with severe traffic on the M4 in both directions between Heston Services and Junction 2, A4, according to the BBC.
National Police Air Service also urged motorists to be careful as many were slowing to look at the smoke.
Several videos and images have appeared on social media showing the blaze.
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