US online job ads fell in May by 51,000 to approximately 4.7 million, according to The Conference Board’s report on online job ads. The May decrease follows a decline in April as well.

Seven of the largest 10 online occupational categories posted decreases in May. Ads for transportation and material-moving jobs logged the largest decrease, down by 27,200 to a total of 357,000. Education, training and library job ads followed, down by 8,400 ads to 168,800.

On the flip side, computer and mathematical science ads rose by 5,000 to 566,500; healthcare practitioners and technical ads increased by 3,400 to 528,800; and food preparation and serving-related ads increased by 2,800 to 214,500 ads.