Civil Engineering MCQJE Level Civil Engineering
NAAQS (National Ambient Air Quality Standards) for PM2.5 (annual average):
Environmental EngineeringAir PollutionMEDIUM
Choose the correct answer
A
40 μg/m³
B
60 μg/m³
C
25 μg/m³
D
15 μg/m³
Correct Answer
A. 40 μg/m³
Why is this the answer?
NAAQS 2009: PM2.5 — annual mean 40 μg/m³ (residential/rural/other); 24-hr standard 60 μg/m³. PM10: annual 60 μg/m³, 24-hr 100 μg/m³. WHO guidelines are stricter (PM2.5 annual: 5 μg/m³, 2021).
Related Environmental Engineering MCQs
More solved Environmental Engineering questions for AE/JE Civil Engineering exams.
- The 'chemical oxygen demand' (COD) test measures:
- The 'Moving Bed Biofilm Reactor' (MBBR) is a biological treatment process where:
- The 'electrostatic precipitator' (ESP) works on the principle of:
- For population 50000 and water demand 135 LPCD, daily water requirement is
- A circular sewer of diameter 0.5 m runs full at velocity 0.6 m/s. Discharge is nearly
- A sedimentation tank receives 10000 m³/day over surface area 250 m². Surface overflow...
Practice more Civil Engineering questions
This MCQ belongs to Magic Mock Test Series — SSC JE Civil (Paper II). Full tests include timed attempts, rank comparison and subject-wise analysis.