Environmental Monitoring Programs in India: Tracking Air and Water Quality

India’s rapid urbanisation has brought enormous pressure on its air and water resources. Tracking the quality of these resources is not optional – it is essential for public health, policy-making, and long-term sustainability. This is where environmental monitoring programmes step in. India operates some of the largest environmental surveillance networks in the developing world, coordinated primarily by the Central Pollution Control Board (CPCB). Let’s look at how these programmes work, what they measure, and why they matter for every Indian city and town.

The Central Pollution Control Board: India’s apex environmental regulator 🔗

The CPCB is a statutory body established in September 1974 under the Water (Prevention and Control of Pollution) Act, 1974. It functions under the Ministry of Environment, Forest and Climate Change (MoEFCC) and serves as the country’s top regulatory authority for pollution control. In 1981, it was given additional responsibilities under the Air (Prevention and Control of Pollution) Act, and later under the Environment (Protection) Act of 1986.

Key functions of the CPCB 🔗

The CPCB carries out several critical roles in India’s environmental governance framework. It advises the central government on matters related to preventing, controlling, and reducing air and water pollution. It plans and executes nationwide pollution control programmes, and provides technical assistance and guidance to State Pollution Control Boards (SPCBs) and Pollution Control Committees (PCCs) in Union Territories. The board also conducts and sponsors research on pollution abatement, collects and publishes technical and statistical data, and lays down standards for air and water quality. In Union Territories, CPCB functions both as a national coordinating body and as the local regulatory authority.

With its head office in New Delhi and nine regional directorates across the country, CPCB maintains oversight over a vast network of monitoring stations, enforcement mechanisms, and data management systems. It coordinates with SPCBs to ensure uniform standards and consistent data across states.

National Air Quality Monitoring Programme (NAMP) 🔗

Air pollution is one of India’s most pressing environmental challenges. To systematically track and assess the quality of ambient air, the CPCB launched the National Air Quality Monitoring Programme (NAMP) in 1984-85. This programme has grown significantly since its inception and is now one of the largest air monitoring networks in any developing country.

How large is the NAMP network? 🔗

When the programme started, it operated a limited number of stations. Over the decades, it has expanded substantially. As of November 2024, NAMP operates 966 monitoring stations spread across 419 cities and towns in 28 states and 7 Union Territories. The monitoring is carried out collaboratively by the CPCB, SPCBs, PCCs, and the National Environmental Engineering Research Institute (NEERI), Nagpur.

What pollutants does NAMP track? 🔗

NAMP focuses on four primary pollutants that are monitored at all locations: Sulphur Dioxide (SO₂), Nitrogen Dioxide (NO₂), Respirable Suspended Particulate Matter (RSPM/PM10), and Fine Particulate Matter (PM2.5). These four are considered the most critical indicators of urban air quality.

Beyond these core pollutants, the programme has gradually added monitoring for other harmful substances at select stations. These include Carbon Monoxide (CO), Ammonia (NH₃), Lead (Pb), Ozone (O₃), Benzene (C₆H₆), Benzo(a)pyrene (BaP), Arsenic (As), and Nickel (Ni). Meteorological parameters such as wind speed, wind direction, relative humidity, and temperature are also recorded alongside air quality data at selected monitoring stations.

How is the monitoring carried out? 🔗

Air quality sampling under NAMP follows a structured protocol. Gaseous pollutants are sampled on a 4-hourly basis, particulate matter on an 8-hourly basis, and PM2.5 on a 24-hourly basis. Sampling takes place twice a week, resulting in approximately 104 observations per year per station. This frequency provides enough data to calculate annual average concentrations for each pollutant and identify seasonal trends.

The CPCB coordinates with all participating agencies to maintain uniformity and consistency in data collection. It also provides financial and technical support to state agencies to operate the monitoring stations. Since a large number of personnel and equipment are involved across different agencies, the CPCB acknowledges that the data should be treated as indicative rather than absolute, accounting for potential variation and personnel biases.

Objectives of air quality monitoring under NAMP 🔗

The programme serves four main objectives. First, it aims to determine the current status and trends of ambient air quality across India. Second, it checks whether the prescribed National Ambient Air Quality Standards (NAAQS) are being met – cities that consistently fail to meet these standards are classified as Non-Attainment Cities. Third, the data helps in developing preventive and corrective measures against air pollution. Fourth, NAMP aims to understand natural cleansing processes such as pollution dilution, dispersion, wind-based movement, dry deposition, precipitation, and chemical transformation of pollutants.

Link to the National Clean Air Programme (NCAP) 🔗

Data from NAMP directly feeds into India’s broader policy frameworks. In 2019, the government launched the National Clean Air Programme (NCAP) with the goal of reducing PM10 concentrations by 20-30% (later revised to 40%) in 131 identified cities by 2025-26 compared to the 2017-18 baseline. According to the Ministry of Environment, 95 of these 131 cities showed improvement in air quality by 2023-24, with 51 cities achieving PM10 reductions of over 20% and 21 cities exceeding 40% reductions. This progress would not be measurable without the systematic data collection that NAMP provides.

National Water Quality Monitoring Programme 🔗

While air quality often grabs headlines, water pollution is an equally critical issue for India – a country with 14 major rivers, 44 medium rivers, and 55 minor rivers, along with thousands of lakes, ponds, and wells that serve as primary drinking water sources. Monitoring the quality of these water resources is essential for public health and ecological preservation.

How water quality monitoring began in India 🔗

India’s water quality monitoring started in 1978 under the Global Environmental Monitoring System (GEMS), an initiative linked to the United Nations Environment Programme. The initial network was modest, with just 24 surface water stations and 11 groundwater stations. In 1984, the Monitoring of Indian National Aquatic Resources System (MINARS) programme was launched, adding 113 stations across 10 major river basins. Over time, a third component – the Yamuna Action Plan (YAP) – was also added to specifically monitor the heavily polluted Yamuna river.

Together, these three components formed a three-tier water quality monitoring programme that has evolved into the current National Water Quality Monitoring Programme (NWMP).

Current scale of the monitoring network 🔗

The NWMP has expanded enormously since its early days. The network now covers 4,484 monitoring stations across 28 states and Union Territories. These stations span an impressive range of water bodies: 719 rivers, 348 lakes, 134 tanks, 107 ponds, 102 creeks and seawater sites, 36 canals, 81 drains, 11 water treatment plants, and 1,235 groundwater wells. Out of these stations, 2,108 are located on rivers alone, reflecting the priority given to protecting India’s riverine systems.

The monitoring process follows a systematic schedule: surface water bodies are sampled on a quarterly basis (four times a year), while groundwater is monitored on a half-yearly basis (twice a year). State Pollution Control Boards carry out the actual sampling and analysis, with CPCB providing coordination, technical support, and data management.

What parameters are analysed? 🔗

Water quality monitoring under the NWMP covers a comprehensive set of parameters. The analysis includes physico-chemical parameters such as temperature, pH, dissolved oxygen, biochemical oxygen demand (BOD), chemical oxygen demand (COD), conductivity, total dissolved solids, and various ions like chloride, sulphate, fluoride, and nitrate. Bacteriological parameters – particularly total coliform and faecal coliform counts – are also tested to assess microbiological contamination.

In addition to these routine parameters, selected samples are analysed for trace metals (including heavy metals like lead, mercury, chromium, cadmium, arsenic, copper, zinc, nickel, and iron) and pesticide residues. For lakes and reservoirs, additional parameters such as Total Kjeldahl Nitrogen, chlorophyll, total plankton count, and productivity are monitored to assess eutrophication risk. Bio-monitoring is also conducted at specific locations, measuring parameters like photosynthesis-respiration ratios and diversity indices.

Why water quality data matters 🔗

The data collected through the NWMP serves multiple purposes. It helps identify polluted stretches of rivers where water quality does not meet the designated use criteria – whether for drinking, bathing, irrigation, or aquatic life. The CPCB uses this data to classify river segments based on their health status and to push for targeted interventions in the most degraded areas. The programme also supports compliance monitoring, ensuring that industries and municipalities are not discharging untreated effluent beyond permissible limits.

The role of the Central Water Commission 🔗

While CPCB leads the national water quality monitoring network, the Central Water Commission (CWC) also plays an important complementary role. The CWC has been monitoring river water quality since the late 1950s and currently operates 552 key locations across major river basins. It maintains a three-tier laboratory system – Level I labs at field stations for basic physical parameters, Level II labs for physico-chemical and bacteriological analysis, and Level III labs for heavy metals and pesticide testing. The CWC’s work adds another layer of data that helps build a complete picture of India’s water quality.

Challenges in environmental monitoring 🔗

Despite the impressive scale of India’s monitoring infrastructure, several challenges persist. The sheer size of the country means that coverage, while extensive, is still not uniform – remote areas and smaller water bodies often remain under-monitored. Reliance on manual sampling rather than continuous automated monitoring can introduce inconsistencies and delays. Multiple agencies involved in data collection mean that differences in equipment quality, personnel training, and analytical methods can affect data comparability.

Power failures at monitoring stations, insufficient skilled operators, and delays in data transmission are practical issues that many state boards face. The CPCB has been working to address these through quality assurance protocols, training programmes, regular field inspections, and gradual expansion of Continuous Ambient Air Quality Monitoring Stations (CAAQMS) and real-time data reporting through platforms like the SAMEER app for air quality.

Moving towards real-time and technology-driven monitoring 🔗

India’s environmental monitoring is gradually shifting from periodic manual sampling to real-time, technology-enabled systems. The deployment of continuous monitoring stations for both air and water, integration of satellite-based remote sensing, and development of digital platforms for data dissemination are key areas of progress. The Air Quality Index (AQI) system, which translates complex pollutant data into easy-to-understand categories, has made air quality information more accessible to the general public.

Similarly, the Air Quality Early Warning System has been deployed in cities like Delhi, Kanpur, and Lucknow to provide advance alerts about deteriorating air quality. These systems enable authorities to take proactive measures – such as restricting construction activities or limiting vehicle movement – before pollution levels spike to dangerous levels.

For water monitoring, the expansion of the network to 4,484 stations and the strengthening of micro-pollutant analysis represent a significant step forward. The long-term goal, as outlined by CPCB, is to build an optimum network of 10,000 monitoring stations across India, coupled with strengthened quality assurance mechanisms.

Why environmental monitoring matters for sustainable development 🔗

Environmental monitoring programmes are not just about collecting numbers. They form the evidence base on which pollution control laws, urban planning decisions, public health interventions, and industrial regulations are built. Without accurate, consistent data on air and water quality, it becomes impossible to measure progress, hold polluters accountable, or allocate resources effectively.

India’s NAMP and NWMP – despite their limitations – represent a serious national commitment to understanding and addressing environmental degradation. As the monitoring infrastructure continues to expand and modernise, the quality and timeliness of data will only improve, enabling more targeted and effective action against pollution in Indian cities.

What do you think? Should India prioritise expanding its monitoring network to cover smaller towns and rural areas, or focus on improving real-time data accuracy in the cities already being monitored? How can citizens use publicly available air and water quality data to push for better environmental outcomes in their communities?

References

1. https://cpcb.nic.in/Introduction/
2. https://en.wikipedia.org/wiki/Central_Pollution_Control_Board
3. https://vajiramandravi.com/current-affairs/central-pollution-control-board/
4. https://cpcb.nic.in/about-namp/
5. https://cpcbenvis.nic.in/air_pollution_main.html
6. https://inclusiveias.com/upsc-environment-national-air-quality-monitoring-programme/
7. https://www.pib.gov.in/PressNoteDetails.aspx?NoteId=153186&ModuleId=3&reg=3&lang=1
8. https://mohua.gov.in/upload/uploadfiles/files/Water_Mgmt_CPCB_PPT_0.pdf
9. https://cpcb.nic.in/nwmp/
10. https://www.mpcb.gov.in/sites/default/files/water-quality/standards-protocols/GuidelinesforWQMonitoring%5B1%5D.pdf
11. https://cwc.gov.in/water_quality