Even as GRAP 4 restrictions were lifted after a temporary improvement in air quality, Delhi Environment Minister Manjinder Singh Sirsa on Friday urged residents to continue following pollution-control measures, warning that weather conditions may worsen again due to an approaching western disturbance. Addressing the media, Sirsa said weather conditions are likely to turn unfavourable, with increased chances of dense haze and fog, which could worsen pollution levels. "According to the weather department and past data, the impact of western disturbance will be visible in Delhi in the next couple of days. The weather will deteriorate again and there is a strong possibility of heavy haze," he said. The minister urged residents to remain vigilant and continue to follow pollution control measures despite the relaxation of restrictions. He appealed to the people not to take out vehicles without valid Pollution Under Control Certificates and to avoid unnecessary travel. "Even though the 50