X  Close Official AQ sensor station - Rockville, Maryland, USA

  PM2.5 PM10 O3 AQI classification       
Current 9 25.6 25.6 Good Air Quality
     
Forecastmin avg maxmin avg maxmin avg max           
10-20-202640455111131551Moderate Air Quality 
    
10-21-2026162335681135Good Air Quality
     
10-22-202611182746927Good Air Quality
     
10-23-202634404910131549Good Air Quality
     
10-24-202636577711192877Moderate Air Quality 
    
10-25-202650618116222981Moderate Air Quality 
    
10-26-202638587515212775Moderate Air Quality 
    
10-27-202657648117202881Moderate Air Quality 
    
            

classification AQI The health effects should be based on 24 hours average values only.
Good Air Quality 0-50 Air quality is considered satisfactory, and air pollution poses little or no risk
Moderate Air Quality 50-100 Air quality is acceptable; however, for some pollutants there may be a moderate health concern for a very small number of people who are unusually sensitive to air pollution.
Unhealthy for some 100-150 Members of sensitive groups may experience health effects. The general public is not likely to be affected.
Unhealthy Air Quality 150-200 Everyone may begin to experience health effects; members of sensitive groups may experience more serious health effects.
Very Unhealthy 200-300 Health alert: everyone may experience more serious health effects
Hazardous Air Quality > 300 Health warnings of emergency conditions. The entire population is more likely to be affected
 More information:  EPA Air Quality Index      Sensor data captured at: 10-22-2026 11:00 am