<Tr> <Td> 123 </Td> <Td> Chongqing, China </Td> </Tr> <Tr> <Td> 109 </Td> <Td> Kanpur, India </Td> </Tr> <Tr> <Td> 109 </Td> <Td> Lucknow, India </Td> </Tr> <Tr> <Td> 104 </Td> <Td> Jakarta, Indonesia </Td> </Tr>

Which of the following is a source of natural air pollution