New DELHI: Levels of tiny pollution particles (PM 2.5) are relatively lower now than in winter. But there is no relief from dirty, toxic air in the city. With the summer heat rising, ozone (O3) levels are breaching the safe standard at several locations in the city.

O3 levels were the highest on Sunday in all of April, according to monitoring by System of Air Quality and Weather Forecasting and Research (SAFAR) under the ministry of earth sciences. O3 was also the lead pollutant along with PM 2.5 on Monday in Delhi’s air quality index (AQI) assessed by the Central Pollution Control Board (CPCB). Read more