Environmental Sciences attracted 2,906 candidates in CSS 2025 and allocated 42 of them, one of the higher allocation counts among the optionals. The paper is a reliable one to score in, with a mean of 45% above the field average, so the attrition that shapes the field is driven by overall merit rather than the difficulty of the exam. With a large field and a generous number of seats, this is one of the more accessible high-volume subjects.
Of the 2,906 who appeared, 102 passed the written stage at a 3.51% pass rate, and 42 of those were allocated. With a mean of 45% comfortably above the 33% threshold, the subject is not the bottleneck; candidates clear it readily and then lose around 60% of their number at the merit cut. The healthy written pass count and the substantial allocation make this one of the more rewarding popular subjects.
The mean of 45% clears the passing line by 12 points, and with the median of 47% sitting above it the distribution leans to the left, supported by a strong body of capable scripts. A standard deviation of 16 points places a candidate one deviation below the mean at 29%, just under the threshold, which marks this as a moderate-risk paper. The average candidate passes comfortably, but a weaker showing can slip below the line, so consistent preparation pays off. The paper is dependable for the well-prepared without being automatic. That two-point gap between a 47% median and a 45% mean is a slight left skew, the weakest scripts pulling the average just below the centre, so the middle candidate scores marginally above the headline mean.
Punjab dominated with 33 of the 42 seats, nearly four-fifths of the total, with Sindh Rural, Balochistan, KPK and Azad Kashmir sharing the rest in small numbers. The heavy Punjab concentration is more pronounced than in most subjects and reflects where preparation for this subject is most developed.
Women took 28 of the 42 seats, a 67% share that runs well ahead of the CSS-wide rate of 50.7%. The over-representation is substantial and consistent, indicating that female candidates who clear the written stage in this subject convert to allocation at a markedly higher rate than men.
Environmental Sciences' mean of 45% sits 1.5 points above the CSS optional-subject average of 43.5%, marking it as a slightly above-average paper to score in. Combined with one of the larger allocation counts and a healthy written pass rate, that makes it one of the more accessible high-volume optionals. The strong female conversion and the generous number of seats are further points in its favour for well-prepared candidates, though the Punjab concentration is a consideration for those from other provinces.
Environmental Sciences is one of the more rewarding popular choices, pairing an above-average paper with a high allocation count and a strong written pass rate. It suits candidates with a genuine grasp of the material who can write analytically under exam conditions, and it converts female candidates particularly well. The pronounced Punjab tilt is the main caveat for candidates domiciled elsewhere.