According to monitoring🔎 by System of Air Quality and Weather Forecasting and Research (SAFAR), although the level📊s of PM 2.5 pollution particles are lower🔻 than during winter❄, levels of polluted and toxic air remain the same in Delhi🌆. They also said that as the heat rises🌡, ozone (O3) levels in Delhi too are becoming unsafe⚠. O3 pollutants were the highest on Sunday in April, with PM 2.5 particles leading📈 on Monday in Delhi’s air quality index (AQI). These readings are occurring despite Delhi’s odd-even scheme which was designed to limit🚫 emissions, causing experts👓 to feel that the city requires a stronger and long-term method to curb pollution⛔. Professor Manju Mohan, Centre for Atmospheric Sciences at IIT Delhi said💬, "High temperatures have a direct correlation with ozone pollution. We need to study the emissions to understand why levels are high.” He added that the main sources were automobiles🚕 & thermal power plants,🏭 among others.