On October 21, the Commission for Air Quality Management (CAQM) invoked Stage I of the Graded Response Action Plan (GRAP) across Delhi-NCR after Delhi’s air quality entered the ‘poor’ category. The revised framework, introduced in September, also brings certain measures concerning diesel generator sets and the entry of some buses into Stage I. The immediate priority is controlling pollution at its source. Authorities must intensify mechanised road sweeping, water sprinkling and dust suppression, ensure construction materials and debris are covered, prevent open waste burning and take action against visibly polluting vehicles. Eligible construction and demolition sites must also comply with monitoring requirements. However, issuing directions is only the first step. Effective implementation across Delhi, Gurugram, Noida, Ghaziabad and Faridabad will require coordination between municipal bodies, traffic police, state governments and pollution-control agencies. Citizens can contribute by avoiding waste burning, using public transport, maintaining vehicles and reporting violations. Early intervention offers an opportunity to limit pollution before conditions worsen, but weather patterns and emissions from multiple sources will continue to influence air quality. The real test is whether timely enforcement can turn GRAP’s preventive measures into cleaner air this winter.