The circulation of the paid-for Associated Newspapers' Standard, which is soon to face competition from News International's freesheet thelondonpaper, fell 19.3 per cent year on year to 300,993. Its sales declined 2.9 per cent on the previous month.
Total sales of daily newspapers fell by 3.7 per cent year on year.
The majority of the quality dailies lost sales during July. However, the Financial Times and The Guardian both bucked the trend by recording sales increases in excess of 3 per cent each, year on year.
The Daily Telegraph's sale was down 1.6 per cent year on year and fell below the 900,000 mark to 897,416. The Times was 4.4 per cent down year on year, with a circulation of 667,496.
Sales of the leading red-tops also continued to fall. The Sun's circulation fell 4 per cent year on year to 3,207,430. The Daily Mirror's sale declined by 5.3 per cent to 1,660,151 and the Daily Star posted the biggest decline of more than 10 per cent to 797,132.
Among the Sundays, The Observer and The Independent on Sunday were the only titles to boost their circulation.