Cary: air quality for the completed day
3 µg/m³ Low
Daily mean PM2.5 on October 21, 2026 (00:00–24:00 UTC): 3 µg/m³ from 5 sensors that passed the quality check — the same value as in the Atmy Data Hub.
LowModerateElevatedHighVery highExtremely high
Cary air quality now
United States · The summary is refreshed every 15 minutes.
October 22
The air is clean now
Cary
18°C
Clear
12AQI
1019hPa
Atmospheric
pressure
38%
Humidity
Cary, October 21, 2026: daily mean PM2.5 3 µg/m³ (5 sensors), level “Low” — as in the Atmy Data Hub. Now (14:00 local time): 2.2 µg/m³. Open methodology and data in JSON: Methodology and data sources · JSON
Right now in Cary, PM2.5 averages 2.2 µg/m³ — “good” on the US EPA scale (approximate, from hourly readings). Mean of 5 sensors on the Atmy network, readings from 13:47–13:47 local time (17:47–17:47 UTC), summary prepared at 14:00 local time. Median: 2.3 µg/m³; range across sensors: 0.0–4.3 µg/m³.
In Cary the air is good right now (approximate, US EPA scale). From 01:00 to 14:00 local time the city mean PM2.5 fell from 4.8 to 2.2 µg/m³. The highest hour was 04:00 with 6.8 µg/m³.
The weather data do not point to a clear reason for this level.
Weather now: clear, 18°C, wind 3 m/s, humidity 38%. No major change in the wind is expected in the coming hours. By 01:00 the temperature will be about 10°C.
Written automatically at 14:00 local time (18:00 UTC) from sensor measurements and the weather forecast. Values are approximate; hypotheses are marked.
11 km/h
Wind, NNW
0 mm
Precipitation today
Air Quality in United States for the Completed Day
Cary: PM2.5 by month
Mean
Oct
Nov
Dec
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
This month
11
5
12
10
10
11
12
9
9
13
15
13
10
12
Monthly means of quality-checked sensors, as in the Data Hub trend; the current month is still incomplete, “-” means no data.
Pollution accumulation index now
6%An estimate of weather conditions · not a PM2.5 forecast
Now65
14.0022.0005.0013.00
Pollution accumulation forecast
Today — October 22
22°/4°
Index by time of day
61/100Moderate
- 61/100
Night - 47/100
Morning - 7/100
Day - 19/100
Evening
Friday — October 23
20°/8°
Index by time of day
46/100Moderate
- 46/100Night
- 36/100Morning
- 6/100Day
- 18/100Evening
Saturday — October 24
20°/10°
Index by time of day
48/100Moderate
- 48/100Night
- 36/100Morning
- 6/100Day
- 20/100Evening
Sunday — October 25
21°/10°
Index by time of day
47/100Moderate
- 47/100Night
- 36/100Morning
- 6/100Day
- 21/100Evening
Monday — October 26
21°/10°
Index by time of day
53/100Moderate
- 53/100Night
- 41/100Morning
- 8/100Day
- 25/100Evening
Tuesday — October 27
23°/11°
Index by time of day
54/100Moderate
- 54/100Night
- 41/100Morning
- 7/100Day
- 18/100Evening
Forecast of conditions that trap pollution near the surface
Weather
18°
Clear. Feels like 16°C
- Morning9°C94%
- Day22°C22%
- Evening13°C32%
Wind
11km/hWind from the NNW
14km/hWind gusts
Wind force: 2
Gusts up to 21 km/h are expected.
10-day weather forecast for Cary
United States
- TodayOct 2222°C4°C
- FriOct 2320°C8°C
- SatOct 2420°C10°C
- SunOct 2521°C10°C
- MonOct 2621°C10°C
- TueOct 27
23°C11°C - WedOct 28
20°C12°C - ThuOct 2923°C11°C
- FriOct 3025°C13°C
- SatOct 3121°C14°C
Where in Cary is the air worse?
See all sensors
Highest current reading: 4.3 µg/m³ (Office). Lowest: 0.0 µg/m³ (Cary House). The list shows every sensor, highest first.
- Good
- Moderate
- Unhealthy for sensitive groups
- Unhealthy
- Very unhealthy
- Hazardous
Source: atmy.ai monitoring network
Who provides the data
Sensors in the summary by network: AirGradient — 5 sensors.
Atmy shows the networks’ readings after the Data Hub’s quality check: test devices and sensors that fail it are left out.
United States: sensors in total
41
BellevueUnited States
4PortlandUnited States
4RenoUnited States
3
Cities with the most sensors
All sensors on the map, by city as the map assigns them; the city’s values count only the sensors that pass the Data Hub’s quality check.
Air quality calendar: Cary
Daily mean PM2.5 of the city sensors, µg/m³
Click a day to see its date and value.
LowModerateElevatedHighVery highExtremely high
Widget for your site
A card with the current PM2.5 in Cary: it is refreshed every 15 minutes and links to this page. Paste the code into your site.
United States · City ranking · All pilot cities
Questions
What was the air quality in Cary over the last completed day?
Daily mean PM2.5 on October 21, 2026 (00:00–24:00 UTC): 3 µg/m³ from 5 sensors that passed the quality check — the same value as in the Atmy Data Hub.
What is the air quality in Cary right now?
Right now in Cary, PM2.5 averages 2.2 µg/m³ — “good” on the US EPA scale (approximate, from hourly readings). Mean of 5 sensors on the Atmy network, readings from 13:47–13:47 local time (17:47–17:47 UTC), summary prepared at 14:00 local time. Median: 2.3 µg/m³; range across sensors: 0.0–4.3 µg/m³.
Is it safe to be outdoors in Cary now?
The current level is “good” (US EPA scale, approximate). Air quality is satisfactory; no restrictions are recommended. This is the standard guidance of the scale, not medical advice.
Where in Cary is the air worse?
Highest current reading: 4.3 µg/m³ (Office). Lowest: 0.0 µg/m³ (Cary House). The list shows every sensor, highest first.
Where do these data come from?
From Atmy sensors and connected public networks (citizen, experimental and government monitors), aggregated by Atmy. Values are approximate; see the methodology.
How often is this page updated?
The summary is rebuilt every 15 minutes from the latest reading of each sensor, each no older than one hour.
Is the air in Cary polluted?
Over the last 325 days with data, the mean daily PM2.5 in Cary was 11.2 µg/m³ — 2.2 times the WHO annual guideline (5 µg/m³). Over the last 30 days: 11.9 µg/m³. From Atmy's archive of daily city means.
When is the air in Cary cleanest?
In Atmy's daily archive, the cleanest month of the last year was January 2026: 8.4 µg/m³ on average.
When is the air in Cary most polluted?
The most polluted month of the last year was July 2026: 15.4 µg/m³ on average.
Is the air in Cary worse in the heating season?
From November to March the mean daily PM2.5 was 11.1 µg/m³, from June to August 13.7 µg/m³ (last 365 days).
Data
Where do these data come from?
The daily value is the Data Hub’s: the mean of the city’s sensors that passed the nightly quality check, each with at least 12 valid hours, and only with sensors at four places 500 m apart; days are UTC.
“Now” uses the same sensors and rule: the mean of their latest readings, each at most 60 minutes old, shown only with sensors at four places 500 m apart reporting.
Source: public Atmy monitoring data. Methodology and data sources · Data terms