LAHORE is choking again, and the government’s answer is to send more machines onto its streets. On Wednesday, its air quality index reached 296, putting children, outdoor workers, and the elderly at particular risk. Yet Punjab plans to acquire 30 more truck-mounted fog cannons. These can suppress road dust locally, but their ability to reduce the fine particles most harmful to health remains questionable. Authorities must explain what the existing fleet has achieved in terms of measurable pollution reduction before spending more public money. Last year, disruptions to Punjab’s air monitoring network raised suspicions........

© Dawn