Travelling from India to New Zealand via china

Hello There!

Is there any Transit Visa needed while travelling from India to New Zealand. I am planning to travel from Delhi-India to Wellington-New Zealand via Guangzhou-china. There is a lay over of 4 hrs in Guangzhou while travelling from India to New Zealand and a layover of 8 hrs while returning. could you please help me to know if there is an exemption of transit visa on this type of travel. I would appreciate your help. Thanks!

Cheers,
Anuj