Milan, January 7 - Air pollution in Milan was below legal limits for the fifth consecutive day on Wednesday, regional environmental protection agency ARPA said Thursday. ARPA registered levels of particulate matter (PM10) of between 33 and 41 micrograms per cubic meter, well below the legal limit of 50 micrograms per cubic meter. On Wednesday PM10 levels were below legal limits across the whole of the northern Lombardy region. Milan has been in the grips of a smog emergency for several weeks. Conditions took a turn for the better over the weekend following a combination of transport and central heating restrictions and a change in the weather, with the arrival of strong winds and rain.