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In cities, air pollution can vary sharply from one street to the next. Fumes may linger between tall buildings, collect at busy junctions or drift towards a school gate. However, cities often lack the detailed forecasts needed to act before levels become dangerous. For Professor Soledad Le Clainche, an applied mathematician at the Technical University of Madrid and leader of the ModelFLOWs research group, better understanding how air moves through cities could help tackle one of Europe's biggest environmental health challenges. As part of an EU-funded research project called MODELAIR, Le Clainche is working with researchers in Belgium, the Netherlands, Sweden and the UK to make the invisible, highly local patterns of urban pollution easier for cities to understand.

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Spanish Prime Minister Pedro Sánchez's decision to call a snap election for 29 November came on the back of a parliamentary defeat. On Friday, the raft of measures he had presented to congress aimed at improving conditions for tenants and trying to address the problem of soaring rentals was narrowly rejected, as parties on the right voted against them. That parliamentary result confirmed that Sánchez's left-wing coalition no longer commanded a majority. But as has so often been the case throughout Sánchez's career, the calling of the election was not a knee-jerk reaction but a carefully thought-out manouevre. His government has been struggling in recent months. His Socialist Party has been mired in corruption, with cases implicating former senior figures in the party, Santos Cerdán and José Luis Ábalos, while the former Socialist Prime Minister, José Luis Rodríguez Zapatero, is facing accusations of having benefited financially from the government's bailout of an airline.

Image caption, Sánchez's announcement comes after a series of measures to tackle the housing crisis was defeated in parliament on Friday Spanish Prime Minister Pedro Sánchez has called an early election for 29 November after recent defeats on legislation aimed at addressing the country's housing crisis. Speculation about a snap election had been building over the weekend after parliament rejected two decree laws put forward by the minority government to protect tenants in the rental market. The eviction of an 87-year-old woman from her home after she was unable to afford a sharp rent rise has sparked nationwide protests and increased pressure for housing reform. In a televised address on Monday, Sánchez said that to push reforms through he needed a broader progressive majority that can overcome the resistance of the elites. Housing has not been the only issue causing problems for Sánchez's leadership in recent months, with his party having been caught up in numerous corruption scandals and facing pressure on other cost-of-living issues and immigration.