Hourly Air Quality Forecast - AQI (US EPA)
Good air quality
Dominant pollutant:
PM2.5
Details
Pollutant Concentrations:
- PM2.5:
11.25 µg/m³
- PM10:
19.17 µg/m³
- O3:
0.027 ppm
- NO2:
7 ppb
- SO2:
1 ppb
- CO:
0.19 ppm
Health Recommendations:
Air quality is considered satisfactory, and air pollution poses little or no risk.
Moderate air quality
Dominant pollutant:
PM2.5
Details
Pollutant Concentrations:
- PM2.5:
12.67 µg/m³
- PM10:
20.14 µg/m³
- O3:
0.025 ppm
- NO2:
7.9 ppb
- SO2:
1 ppb
- CO:
0.20 ppm
Health Recommendations:
Air quality is acceptable; some pollutants may pose a risk for a small number of unusually sensitive people.
Moderate air quality
Dominant pollutant:
PM2.5
Details
Pollutant Concentrations:
- PM2.5:
14.29 µg/m³
- PM10:
20.84 µg/m³
- O3:
0.028 ppm
- NO2:
7.3 ppb
- SO2:
1 ppb
- CO:
0.21 ppm
Health Recommendations:
Air quality is acceptable; some pollutants may pose a risk for a small number of unusually sensitive people.
Moderate air quality
Dominant pollutant:
PM2.5
Details
Pollutant Concentrations:
- PM2.5:
16 µg/m³
- PM10:
21.13 µg/m³
- O3:
0.034 ppm
- NO2:
6.3 ppb
- SO2:
0.9 ppb
- CO:
0.21 ppm
Health Recommendations:
Air quality is acceptable; some pollutants may pose a risk for a small number of unusually sensitive people.
Moderate air quality
Dominant pollutant:
PM2.5
Details
Pollutant Concentrations:
- PM2.5:
13.77 µg/m³
- PM10:
16.56 µg/m³
- O3:
0.046 ppm
- NO2:
3.3 ppb
- SO2:
0.7 ppb
- CO:
0.19 ppm
Health Recommendations:
Air quality is acceptable; some pollutants may pose a risk for a small number of unusually sensitive people.
Good air quality
Dominant pollutant:
PM2.5
Details
Pollutant Concentrations:
- PM2.5:
11.35 µg/m³
- PM10:
12.95 µg/m³
- O3:
0.051 ppm
- NO2:
1.9 ppb
- SO2:
0.4 ppb
- CO:
0.17 ppm
Health Recommendations:
Air quality is considered satisfactory, and air pollution poses little or no risk.
Good air quality
Dominant pollutant:
O3
Details
Pollutant Concentrations:
- PM2.5:
9.59 µg/m³
- PM10:
10.62 µg/m³
- O3:
0.053 ppm
- NO2:
1.2 ppb
- SO2:
0.3 ppb
- CO:
0.16 ppm
Health Recommendations:
Air quality is considered satisfactory, and air pollution poses little or no risk.
Good air quality
Dominant pollutant:
O3
Details
Pollutant Concentrations:
- PM2.5:
7.76 µg/m³
- PM10:
8.49 µg/m³
- O3:
0.053 ppm
- NO2:
1 ppb
- SO2:
0.3 ppb
- CO:
0.15 ppm
Health Recommendations:
Air quality is considered satisfactory, and air pollution poses little or no risk.
Good air quality
Dominant pollutant:
O3
Details
Pollutant Concentrations:
- PM2.5:
5.49 µg/m³
- PM10:
6.04 µg/m³
- O3:
0.051 ppm
- NO2:
1 ppb
- SO2:
0.2 ppb
- CO:
0.15 ppm
Health Recommendations:
Air quality is considered satisfactory, and air pollution poses little or no risk.
Good air quality
Dominant pollutant:
O3
Details
Pollutant Concentrations:
- PM2.5:
3.23 µg/m³
- PM10:
3.69 µg/m³
- O3:
0.048 ppm
- NO2:
1.3 ppb
- SO2:
0.2 ppb
- CO:
0.14 ppm
Health Recommendations:
Air quality is considered satisfactory, and air pollution poses little or no risk.
Good air quality
Dominant pollutant:
O3
Details
Pollutant Concentrations:
- PM2.5:
1.61 µg/m³
- PM10:
2.03 µg/m³
- O3:
0.043 ppm
- NO2:
1.7 ppb
- SO2:
0.2 ppb
- CO:
0.14 ppm
Health Recommendations:
Air quality is considered satisfactory, and air pollution poses little or no risk.
Good air quality
Dominant pollutant:
O3
Details
Pollutant Concentrations:
- PM2.5:
0.89 µg/m³
- PM10:
1.34 µg/m³
- O3:
0.040 ppm
- NO2:
2.1 ppb
- SO2:
0.2 ppb
- CO:
0.14 ppm
Health Recommendations:
Air quality is considered satisfactory, and air pollution poses little or no risk.
Good air quality
Dominant pollutant:
O3
Details
Pollutant Concentrations:
- PM2.5:
0.64 µg/m³
- PM10:
1.12 µg/m³
- O3:
0.037 ppm
- NO2:
2.3 ppb
- SO2:
0.2 ppb
- CO:
0.15 ppm
Health Recommendations:
Air quality is considered satisfactory, and air pollution poses little or no risk.
Good air quality
Dominant pollutant:
O3
Details
Pollutant Concentrations:
- PM2.5:
0.55 µg/m³
- PM10:
1.05 µg/m³
- O3:
0.034 ppm
- NO2:
2.4 ppb
- SO2:
0.2 ppb
- CO:
0.15 ppm
Health Recommendations:
Air quality is considered satisfactory, and air pollution poses little or no risk.
Good air quality
Dominant pollutant:
O3
Details
Pollutant Concentrations:
- PM2.5:
0.55 µg/m³
- PM10:
1.07 µg/m³
- O3:
0.032 ppm
- NO2:
2.5 ppb
- SO2:
0.2 ppb
- CO:
0.15 ppm
Health Recommendations:
Air quality is considered satisfactory, and air pollution poses little or no risk.
Good air quality
Dominant pollutant:
O3
Details
Pollutant Concentrations:
- PM2.5:
0.56 µg/m³
- PM10:
1.1 µg/m³
- O3:
0.031 ppm
- NO2:
2.5 ppb
- SO2:
0.2 ppb
- CO:
0.15 ppm
Health Recommendations:
Air quality is considered satisfactory, and air pollution poses little or no risk.
Weather Alerts and Warnings for Waltham
Moderate
Expected
Observed
Special Weather Statement
Special Weather Statement issued October 29 at 2:47PM EDT by NWS Boston/Norton MA
Oct 29, 2:47 PM
→ Oct 30, 6:15 PM
The combination of dry fuels, gusty northwest winds up to 25 to 35
mph, and minimum relative humidity values near 40 percent will
contribute to an elevated risk of fire spread across southern New
England. The lowest relative humidity and strongest wind gusts
are expected during the late morning to mid afternoon hours on
Friday.
Use extra caution if handling any potential ignition sources such
as machinery or matches, and ensure to properly extinguish or
dispose of cigarette butts.
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