Air pollution

• Researchers uncover promising breakthrough for future airlines and flights: 'Major near-term step' - "Efficiency could be improved."
• Toxic smog blankets New Delhi, disrupting travel and plunging air quality to hazardous levels - Dense toxic smog blanketed India’s national capital Monday, pushing air pollution levels to their worst levels in weeks, disrupting travel and causing authorities to impose the strictest containment measures. Over 50 trains arriving and de