BHAG SINGH vs STATE OF PUNJAB .

The Supreme Court upheld the Punjab and Haryana High Court's dismissal of a Writ Petition challenging the operation of industries in residential areas, citing the Air (Prevention and Control of Pollution) Act, 1981, particularly Sections 21 and 31-A. The Court found that the industries had complied with pollution control norms as per the Punjab Pollution Control Board's report, and noted that the new Master Plan had not yet been notified, thus the existing industrial status remained valid. The Court emphasized the need for periodic verification of pollution standards but affirmed the High Court's directive to take action in case of deviations.