United States · The summary is refreshed every 15 minutes.
October 22
The air is clean now
Phoenix
20°C
Cloudy
47AQI
1011hPa
Atmospheric
pressure
95%
Humidity
Phoenix, October 21, 2026: daily mean PM2.5 3 µg/m³ (4 sensors), level “Low” — as in the Atmy Data Hub. Now (11:00 local time): 8.4 µg/m³. Open methodology and data in JSON: Methodology and data sources · JSON
Right now in Phoenix, PM2.5 averages 8.4 µg/m³ — “good” on the US EPA scale (approximate, from hourly readings). Mean of 4 sensors on the Atmy network, readings from 10:47–10:47 local time (17:47–17:47 UTC), summary prepared at 11:00 local time. Median: 3.9 µg/m³; range across sensors: 0.0–25.7 µg/m³.
In Phoenix the air is good right now (approximate, US EPA scale). From 22:00 to 11:00 local time the city mean PM2.5 rose from 6.3 to 8.4 µg/m³. The highest hour was 00:00 with 14.5 µg/m³.
The wind is weak (1 m/s): particles are likely accumulating near the ground. High humidity (95%) possibly makes optical sensors read somewhat higher.
Weather now: cloudy, 20°C, wind 1 m/s, humidity 95%. Precipitation is expected around 11:00; it may wash particles out.
Written automatically at 11:00 local time (18:00 UTC) from sensor measurements and the weather forecast. Values are approximate; hypotheses are marked.
4 km/h
Wind, S
6.5 mm
Precipitation today
3 µg/m³ Low
Daily mean PM2.5 on October 21, 2026 (00:00–24:00 UTC): 3 µg/m³ from 4 sensors that passed the quality check — the same value as in the Atmy Data Hub.
Monthly means of quality-checked sensors, as in the Data Hub trend; the current month is still incomplete, “-” means no data.
32%An estimate of weather conditions · not a PM2.5 forecast
25°/18°
Index by time of day
45/100Moderate
Night
Morning
Day
Evening24°/14°
Index by time of day
57/100Moderate
NightMorningDayEvening25°/15°
Index by time of day
54/100Moderate
NightMorningDayEvening26°/20°
Index by time of day
52/100Moderate
NightMorningDayEvening29°/21°
Index by time of day
45/100Moderate
NightMorningDayEvening30°/22°
Index by time of day
49/100Moderate
NightMorningDayEveningForecast of conditions that trap pollution near the surface
20°
Cloudy. Feels like 23°C
20°C95%
25°C77%19°C57%4km/hWind from the S
18km/hWind gusts
Wind force: 1
Gusts up to 35 km/h are expected.
United States
25°C18°C24°C14°C25°C15°C26°C20°C29°C21°C30°C22°C29°C25°C29°C24°C28°C23°C26°C22°C
Highest current reading: 25.7 µg/m³ (7160 Optima Kierland). Lowest: 0.0 µg/m³ (Mountain view). The list shows every sensor, highest first.
Source: atmy.ai monitoring network
Sensors in the summary by network: AirGradient — 4 sensors.
Atmy shows the networks’ readings after the Data Hub’s quality check: test devices and sensors that fail it are left out.
41
BellevueUnited States
4PortlandUnited States
4RenoUnited States
3Cities 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.
Daily mean PM2.5 of the city sensors, µg/m³
Click a day to see its date and value.
A card with the current PM2.5 in Phoenix: it is refreshed every 15 minutes and links to this page. Paste the code into your site.
United States · City ranking · All pilot cities
Daily mean PM2.5 on October 21, 2026 (00:00–24:00 UTC): 3 µg/m³ from 4 sensors that passed the quality check — the same value as in the Atmy Data Hub.
Right now in Phoenix, PM2.5 averages 8.4 µg/m³ — “good” on the US EPA scale (approximate, from hourly readings). Mean of 4 sensors on the Atmy network, readings from 10:47–10:47 local time (17:47–17:47 UTC), summary prepared at 11:00 local time. Median: 3.9 µg/m³; range across sensors: 0.0–25.7 µg/m³.
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.
Highest current reading: 25.7 µg/m³ (7160 Optima Kierland). Lowest: 0.0 µg/m³ (Mountain view). The list shows every sensor, highest first.
From Atmy sensors and connected public networks (citizen, experimental and government monitors), aggregated by Atmy. Values are approximate; see the methodology.
The summary is rebuilt every 15 minutes from the latest reading of each sensor, each no older than one hour.
Over the last 123 days with data, the mean daily PM2.5 in Phoenix was 1.8 µg/m³ — within the WHO annual guideline (5 µg/m³). Over the last 30 days: — µg/m³. From Atmy's archive of daily city means.
In Atmy's daily archive, the cleanest month of the last year was April 2026: 0.7 µg/m³ on average.
The most polluted month of the last year was July 2026: 2.7 µg/m³ on average.
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
