buses, undergrounds and trains that people pay to travel on
public transport
things some people don’t want and leave on the street
rubbbish / garbage
areas of grass in a city
green spaces
when an electrical system stops working
power cut
the busiest period in a city for traffic
rush hour
a long line of vehicles waiting to move
traffic jam
words or pictures that we see on walls
graffiti
dirty air in towns and cities
pollution
big numbers of people in one place
crowds