car exhaust fumes (n)

Car exhaust fumes causes air pollution.
The acrid smell of car exhaust fumes lingered in the air as rush hour traffic came to a standstill on the congested city streets.
Walking behind the old diesel truck, I couldn't escape the noxious cloud of car exhaust fumes that hung in the still evening air.
The hazy skyline over the urban area was a visible testament to the pervasive problem of car exhaust fumes, as the sun struggled to break through the layers of pollution.