Trams are electrically driven so in themselves they do not pollute.
Trams are not bad for the environment, though if there a lot of them then sometimes they can cause damage. It would be best not to use trams.
Trams have a generally positive impact on the environment compared to other forms of transportation. They produce lower greenhouse gas emissions per passenger mile, especially when powered by electricity from renewable sources. Additionally, trams help reduce traffic congestion and air pollution by encouraging public transit use, which decreases reliance on cars. However, their construction and operation can have localized ecological impacts, such as habitat disruption and noise pollution.
A tram can be a monorail without wheels.
In Star Trek the air trams are a transport vehicle from the 23rd century frequently used in the San Francisco Bay area. Captain Kirk took an air tram to Starfleet Headquarters once.
air pollution travels in the air
The motto of Yarra Trams is 'Love Your Trams'.
there's air pollution everywhere no matter where you go there's air pollution.
water pollution: polluting water air pollution: polluting air
There are many types of air pollution. There can be particulate air pollution from things like dirt and pollen. There can be chemical air pollution from things like engines.
Air pollution is negative
air pollution
Air pollution is not useful. It is a problem.