It's almost end of September with festivals approaching from October onwards and with onset of winter, pollution in Delhi is always in its peak.

Amid the pollution problem in Delhi does the National Capital Region have enough devices to measure the extent of its pollution problem?

The Central Pollution Control Board's (CPCB) list of Continuous Ambient Air Quality Monitoring Stations in Delhi-NCR shows a total of 80 stations in the National Capital Region. Of these, half, that is 40 stations, are in Delhi alone.

Of these 80 stations in the NCR, nine were found inactive on Sunday, as reported by IndianExpress going by the CPCB's list.

The inactive stations include five of the 40 stations in Delhi, one out of four stations each in Gurgaon and Noida, and the only stations that have been installed in Hapur and Baghpat.

The districts of Bahadurgarh, Sonipat, Karnal, Panipat, Bhiwadi and Jind (in Haryana), and Bulandshahr and Muzaffarnagar (in UP) have only a single station each. Ghaziabad has four such stations while Greater Noida two.

Over the past week, AQI has mostly been in the moderate/satisfactory categories across Delhi-NCR.

An official in a regional offices of the UPPCB in the NCR pointed out that restrictions under the Graded Response Action Plan (GRAP) kick in based on the AQI in Delhi, irrespective of the number of air quality monitoring stations in the other districts of the NCR.