What exactly is in Beijing's polluted air?China's landlocked capital of 20m people has experienced record-breaking pollution over the last few days. Guardian partner, the Climate Desk, breaks down exactly what's in the air Beijing air pollution from Climate Desk Photograph: Climate Desk Illustration: Climate DeskView image in fullscreenBeijing air pollution from Climate Desk Photograph: Climate Desk Illustration: Climate DeskExplore more on these topicsPollutionChina