coal

Perhaps surprisingly, this was the first time that the world had taken direct aim at coal, oil and gas.

Last week, the government banned all activities that involve the use of coal and firewood, as well as diesel generator use for non-emergency services.

Air pollution sources include burning coal for energy, the exhaust from cars and trucks, as well as smoke from fires set by farmers in India.

Non-essential construction has also been banned, and citizens told to avoid burning coal.

Nuclear energy is often hailed for its low carbon emissions compared to other sources like natural gas or coal.