Trusted Environmental & Laboratory Testing Experts
Delivering precise, reliable, and accredited testing and calibration services across India safeguarding environments, industries, and communities.
About Us
Accurate Testing and Analysis (OPC) Private Limited is a NABL-accredited testing laboratory located in Najafgarh, New Delhi, committed to delivering scientific precision in every analysis.
Established to address the growing need for reliable environmental and laboratory testing, ATAPL operates a state-of-the-art permanent testing facility alongside a mobile site-testing division. Our laboratory is fully compliant with the quality management requirements of ISO/IEC 17025:2017, as independently verified by the National Accreditation Board for Testing and Calibration Laboratories (NABL).
We serve clients across diverse sectors including construction, pharmaceuticals, manufacturing, municipalities, agriculture, and research providing traceable, defensible test data that informs critical decisions on health, safety, and environmental protection.
Accredited Test Parameters
Valid Until (NABL)
Testing Disciplines
Why Choose Us
Quality Services
Our NABL-accredited scope encompasses over 316 parameters across three primary disciplines. Services are grouped below for clarity, all results are reported against recognised Indian and international standards.
Atmospheric Pollution & Environmental Testing
Ambient Air Quality
• Ammonia (NH3) - IS 5182
• Carbon Monoxide (CO) - IS 5182
• Nitrogen Dioxide (NO2) - IS 5182
• Ozone (O3) - IS 5182
• Particulate Matter PM10 - IS 5182
• Particulate Matter PM2.5 - IS 5182
• Sulphur Dioxide (SO2) - IS 5182
Stack / Emission Testing
• Carbon Dioxide (CO2) - IS 13270
• Carbon Monoxide (CO) - IS 13270
• Oxides of Nitrogen (NOx) - IS 11255
• Oxygen (O2) - IS 13270
• Particulate Matter - IS 11255
• Sulphur Dioxide (SO2) - IS 11255
Noise Monitoring
Indoor Air & Workplace Environment
• Relative Humidity - ATAPL/SOP/01-SP-70
• Temperature - ATAPL/SOP/01-SP-69
• Workplace / Industrial Area Lighting: Lux Level - IS 6665
Water Testing
Drinking Water
• Acidity, Alkalinity as CaCO3 (Phenolphthalein & Total)
• Ammonia (NH3) & Ammoniacal Nitrogen
• Calcium (Ca), Magnesium (Mg), Total Hardness (CaCO3)
• Carbonate & Bicarbonate
• Chloramines (Cl₂), Residual Chlorine (Cl₂)
• Chloride (Cl), Fluoride (F), Sulphate (SO4), Sulphide (S), Sulphite (SO3)
• Colour (Platinum-Cobalt Visual Comparison), Odour, Taste
• Electrical Conductivity, pH, Temperature, Turbidity
• Inorganic Fixed Solids, Total Dissolved Solids (Gravimetric)
• Nitrate (NO3), Nitrite (NO2), Phosphate (PO4)
Ground Water
• Acidity, Total Alkalinity (CaCO3), Carbonate & Bicarbonate
• Ammoniacal Nitrogen, Calcium, Magnesium, Total Hardness
• Chloramine, Chloride, Colour, Odour, Taste, Temperature
• Fluoride (SPADNS Method), Nitrate, Nitrite, pH
• Phosphate (Stannous Chloride), Residual Chlorine
• Specific Conductivity, Sulfate (Turbidity Method), Sulphite
• Sulfide, Total Dissolved Solids, Total Solids, Turbidity
Waste Water
• Alkalinity, Ammonia, Ammoniacal Nitrogen
• BOD, COD, Dissolved Oxygen
• Calcium, Magnesium, Chloride, Colour, Fluoride
• Electrical Conductivity, pH, Temperature, Turbidity
• Free Carbon Dioxide, Inorganic Fixed Solids, Nitrite
• Odour, Oil & Grease, Organic Volatile Solids
• Phosphate, Potassium, Residual Chlorine, Sodium
• Settleable Solids, Sulphate, Sulphide, Sulphites
• Total Dissolved Solids, Total Hardness, Total Kjeldahl Nitrogen
• Total Solids, Total Suspended Solids
Soil, Sediment & Sludge Testing
Soil & Sediments
• Electrical Conductivity - IS 14767
• Exchangeable Sodium, Calcium, Magnesium, Potassium - ATAPL SOPs
• Moisture - IS 2720 (Part 2)
• Organic Carbon & Organic Matter - IS 2720 (Part 22)
• pH - IS 2720 (Part 26)
• Sodium Adsorption Ratio - ATAPL/SOP/01-SP-81
• Sulphate Content & Water-Soluble Sulphate - IS 2720 (Part 27)
• Total Kjeldahl Nitrogen - IS 14684
• Water Holding Capacity - IS 14765
Sludge
• Potassium (K) - IS 9497
• Sodium (Na) - IS 9497
Cleanroom, Biosafety & Controlled Environment Testing (Site Testing)
Cleanrooms & Associated Controlled Environments
• Air Flow Direction Visualisation Test
• Air Pressure Difference Test
• Air Velocity Measurement & Air Change Determination
• HEPA / ULPA Filter Leakage Test (ISO 14644-3 & BS EN 1822-1)
• Humidity, Temperature, Illuminance (Lux) Level, Sound Level
• Recovery Test
Biosafety Cabinets
• Airborne Particle Count for Classification
• Downflow Velocity (ANSI/NSF 49 & EN 12469)
• Inflow Velocity (ANSI/NSF 49 & EN 12469)
• Installed Filter System Leakage Test
Laminar Air Flow Units
• Airflow Velocity Measurement IEST-RP-CC-002-86
• Filter Pressure Drop IEST-RP-CC-002-86
• HEPA / ULPA Filter Leakage Test
Pass Boxes
• Airflow Velocity Measurement
• Filter Pressure Drop
• Installed Filter System Leakage
Fume Hoods
• Local Fume Visualisation
Ambient / Site Environmental Monitoring
• Source Noise Level (Machinery) - IS 4758
• Indoor Air: Relative Humidity - ATAPL SOP
• Workplace Lighting: Lux Level - IS 6665
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