Which planet has these characteristics: appears blue
is almost 32,000 miles in diameter
is covered in methane clouds
has around 30 moons
has an axis that is sideways so it appears to "roll" around the sun
has a year that is 30685.4 Earth days long
has a 17 hour 14 minute day

Air pollution: “combustion results in gases such as nitrogen oxides, nitrogen dioxide and particulates. the main causes of air pollution include transport, domestic combustion and industrial processes. pollutants from these sources can cause problems in the immediate vicinity and a distance away.”