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In page Eurasian crag martin:

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The European population of the Eurasian crag martin is estimated to be 360,000–1,110,000 individuals, including 120,000–370,000 breeding pairs. A rough estimate of the worldwide population is 500,000–5,000,000 individuals, with Europe hosting between one-quarter and one-half of the total. The population is estimated to be increasing following a northward expansion, which may be partly due to increased use of man-made structures as nest sites. Expansions of the range have been reported in Austria (where motorway bridges are used as nest sites), Switzerland, the former Yugoslavia, Romania, and Bulgaria. With its very large range and high numbers, the Eurasian crag martin is not considered to be threatened, and it is classed as Least Concern on the IUCN Red List.[1][2]