With reference to the air pollution in Delhi, consider the following statements:
1. The average contribution of stubble burning to Delhi’s PM2.5 level in November 2021 was 14.6%, according to data from the government-run monitoring agency SAFAR.
2. Delhi usually experiences two spells of high air pollution during winter, one in October-November and the other in December-January.
Which of the statements given above is/are correct?