The second problem for visiting teams is the combination of weather and air quality. India is a notoriously hot country for much of the year, and while these conditions may not be so alien to Australians, teams such as England or New Zealand can struggle to perform to their usual high standards in the heat and humidity. Air pollution is also a problem, because the large Indian population centres where matches are played tend to suffer from very poor air quality. This can cause visiting players to have difficulties in breathing, which is a problem both on the field and also in sleeping at night.