ID: 485

AQSQID: 250250042

Site Name: Boston - Roxbury

Added: April 21, 2020, 6:24 p.m.

Updated: July 25, 2021, 10:55 p.m.

Location: Roxbury (Roxbury), MA

Reporting: True, Located: True

Current AQI: 34.0

Roxbury (Roxbury) MA, US: 42.329399, -71.082497

Date Observed (UTC) NOX NO NOY NO2 NO2Y SO2 OZONE CO PM10 PM2.5 AQI AQI/500
July 25, 2021, 9 p.m. 0.0 ppb (0) 0.0 ppb (0) 3.5 ppb (4) 0.0 ppb (0) N/A 0.0 ppb (0) 35.0 ppb (33) 0.18 ppb (3) N/A 8.0 μg/m3 (34) 34.0
 
July 25, 2021, 8 p.m. 0.0 ppb (0) 0.0 ppb (0) 3.4 ppb (4) 0.0 ppb (0) N/A 0.0 ppb (0) 37.0 ppb (35) 0.19 ppb (3) N/A 3.0 μg/m3 (13) 35.0
 
July 25, 2021, 7 p.m. 0.0 ppb (0) 0.0 ppb (0) 3.1 ppb (3) 0.0 ppb (0) N/A 0.0 ppb (0) 39.0 ppb (37) 0.2 ppb (3) N/A 4.0 μg/m3 (17) 37.0
 
July 25, 2021, 6 p.m. 1.0 ppb (1) 1.0 ppb (1) 3.4 ppb (4) 0.0 ppb (0) N/A 0.0 ppb (0) 39.0 ppb (37) 0.19 ppb (3) N/A 4.0 μg/m3 (17) 37.0
 
July 25, 2021, 5 p.m. 0.0 ppb (0) 0.0 ppb (0) 3.5 ppb (4) 0.0 ppb (0) N/A 0.0 ppb (0) 40.0 ppb (38) 0.19 ppb (3) N/A 4.0 μg/m3 (17) 38.0
 
July 25, 2021, 4 p.m. 1.0 ppb (1) 0.0 ppb (0) 3.4 ppb (4) 0.0 ppb (0) N/A 0.0 ppb (0) 39.0 ppb (37) 0.23 ppb (3) N/A 3.0 μg/m3 (13) 37.0
 
July 25, 2021, 3 p.m. 1.0 ppb (1) 0.0 ppb (0) 3.7 ppb (4) 0.0 ppb (0) N/A 0.0 ppb (0) 39.0 ppb (37) 0.17 ppb (3) N/A 5.0 μg/m3 (21) 37.0
 
July 25, 2021, 2 p.m. 0.0 ppb (0) 0.0 ppb (0) 3.1 ppb (3) 0.0 ppb (0) N/A 1.0 ppb (2) 39.0 ppb (37) 0.17 ppb (3) N/A 8.0 μg/m3 (34) 37.0
 
July 25, 2021, 1 p.m. 1.0 ppb (1) 0.0 ppb (0) 4.3 ppb (5) 1.0 ppb (1) N/A 0.0 ppb (0) 36.0 ppb (34) 0.17 ppb (3) N/A 3.0 μg/m3 (13) 34.0
 
July 25, 2021, noon 0.0 ppb (0) 0.0 ppb (0) 3.4 ppb (4) 0.0 ppb (0) N/A 0.0 ppb (0) 36.0 ppb (34) 0.18 ppb (3) N/A 5.0 μg/m3 (21) 34.0
 
July 25, 2021, 11 a.m. 0.0 ppb (0) 0.0 ppb (0) 3.2 ppb (4) 0.0 ppb (0) N/A 0.0 ppb (0) 35.0 ppb (33) 0.16 ppb (3) N/A 5.0 μg/m3 (21) 33.0
 
July 25, 2021, 10 a.m. 0.0 ppb (0) 0.0 ppb (0) 3.3 ppb (4) 0.0 ppb (0) N/A 0.0 ppb (0) 33.0 ppb (31) N/A N/A 2.0 μg/m3 (9) 31.0
 
July 25, 2021, 9 a.m. 0.0 ppb (0) 0.0 ppb (0) 3.0 ppb (3) 0.0 ppb (0) N/A 0.0 ppb (0) 32.0 ppb (30) 0.17 ppb (3) N/A -1.0 μg/m3 (0) 30.0
 
July 25, 2021, 8 a.m. 2.0 ppb (2) 0.0 ppb (0) 4.5 ppb (5) 2.0 ppb (2) N/A 0.0 ppb (0) N/A 0.18 ppb (3) N/A 2.0 μg/m3 (9) 9.0
 
July 25, 2021, 7 a.m. N/A N/A 8.1 ppb (8) N/A N/A 0.0 ppb (0) 28.0 ppb (26) 0.19 ppb (3) N/A 4.0 μg/m3 (17) 26.0
 
July 25, 2021, 6 a.m. N/A N/A 6.2 ppb (6) N/A N/A 0.0 ppb (0) 31.0 ppb (29) 0.21 ppb (3) N/A 6.0 μg/m3 (25) 29.0
 
July 25, 2021, 5 a.m. N/A N/A 7.0 ppb (7) N/A N/A 0.0 ppb (0) 32.0 ppb (30) N/A N/A 9.0 μg/m3 (38) 38.0
 
July 25, 2021, 4 a.m. 3.0 ppb (3) 0.0 ppb (0) 6.1 ppb (6) 3.0 ppb (3) N/A N/A 36.0 ppb (34) 0.23 ppb (3) N/A 8.0 μg/m3 (34) 34.0
 
July 25, 2021, 3 a.m. 4.0 ppb (4) 0.0 ppb (0) 6.8 ppb (7) 3.0 ppb (3) N/A N/A 34.0 ppb (32) 0.24 ppb (3) N/A 10.0 μg/m3 (42) 42.0
 
July 25, 2021, 2 a.m. 5.0 ppb (5) 0.0 ppb (0) 8.3 ppb (8) 5.0 ppb (5) N/A N/A 33.0 ppb (31) 0.28 ppb (4) N/A 9.0 μg/m3 (38) 38.0
 
July 25, 2021, 1 a.m. 4.0 ppb (4) 0.0 ppb (0) 7.7 ppb (8) 4.0 ppb (4) N/A 0.0 ppb (0) 34.0 ppb (32) 0.26 ppb (4) N/A 9.0 μg/m3 (38) 38.0
 
July 25, 2021, midnight 2.0 ppb (2) 0.0 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 32.0 ppb (30) 0.23 ppb (3) N/A 1.0 μg/m3 (5) 30.0
 
July 24, 2021, 11 p.m. 6.0 ppb (6) 1.0 ppb (1) N/A 5.0 ppb (5) N/A 0.0 ppb (0) 27.0 ppb (25) 0.29 ppb (4) N/A 2.0 μg/m3 (9) 25.0
 
July 24, 2021, 10 p.m. 4.0 ppb (4) 1.0 ppb (1) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 31.0 ppb (29) 0.25 ppb (3) N/A 3.0 μg/m3 (13) 29.0
 
July 24, 2021, 9 p.m. 4.0 ppb (4) 1.0 ppb (1) 6.6 ppb (7) 2.0 ppb (2) N/A 0.0 ppb (0) 31.0 ppb (29) 0.21 ppb (3) N/A 4.0 μg/m3 (17) 29.0
 
July 24, 2021, 8 p.m. 3.0 ppb (3) 2.0 ppb (2) 6.2 ppb (6) 2.0 ppb (2) N/A 0.0 ppb (0) 32.0 ppb (30) 0.27 ppb (4) N/A 2.0 μg/m3 (9) 30.0
 
July 24, 2021, 7 p.m. 3.0 ppb (3) 2.0 ppb (2) 6.4 ppb (7) 2.0 ppb (2) N/A 0.0 ppb (0) 34.0 ppb (32) 0.32 ppb (4) N/A 1.0 μg/m3 (5) 32.0
 
July 24, 2021, 6 p.m. 3.0 ppb (3) 1.0 ppb (1) 6.2 ppb (6) 2.0 ppb (2) N/A 0.0 ppb (0) 36.0 ppb (34) 0.34 ppb (4) N/A -1.0 μg/m3 (0) 34.0
 
July 24, 2021, 5 p.m. 4.0 ppb (4) 2.0 ppb (2) 7.8 ppb (8) 3.0 ppb (3) N/A 1.0 ppb (2) 36.0 ppb (34) 0.5 ppb (6) N/A 1.0 μg/m3 (5) 34.0
 
July 24, 2021, 4 p.m. 3.0 ppb (3) 1.0 ppb (1) 6.6 ppb (7) 2.0 ppb (2) N/A 0.0 ppb (0) 34.0 ppb (32) 0.34 ppb (4) N/A 3.0 μg/m3 (13) 32.0
 
July 24, 2021, 3 p.m. 8.0 ppb (8) 3.0 ppb (3) 11.6 ppb (11) 5.0 ppb (5) N/A 1.0 ppb (2) 30.0 ppb (28) N/A N/A 0.0 μg/m3 (0) 28.0
 
July 24, 2021, 2 p.m. 6.0 ppb (6) 2.0 ppb (2) 8.8 ppb (9) 4.0 ppb (4) N/A 1.0 ppb (2) 29.0 ppb (27) 0.19 ppb (3) N/A 1.0 μg/m3 (5) 27.0
 
July 24, 2021, 1 p.m. 13.0 ppb (13) 5.0 ppb (5) 16.9 ppb (16) 9.0 ppb (9) N/A 1.0 ppb (2) 22.0 ppb (21) 0.21 ppb (3) N/A 2.0 μg/m3 (9) 21.0
 
July 24, 2021, noon 9.0 ppb (9) 4.0 ppb (4) 11.8 ppb (12) 5.0 ppb (5) N/A 0.0 ppb (0) 18.0 ppb (17) 0.19 ppb (3) N/A 0.0 μg/m3 (0) 17.0
 
July 24, 2021, 11 a.m. 11.0 ppb (11) 6.0 ppb (6) 14.1 ppb (14) 5.0 ppb (5) N/A 0.0 ppb (0) 14.0 ppb (13) 0.19 ppb (3) N/A -1.0 μg/m3 (0) 14.0
 
July 24, 2021, 10 a.m. 26.0 ppb (25) 17.0 ppb (17) 30.7 ppb (29) 9.0 ppb (9) N/A 1.0 ppb (2) 7.0 ppb (7) 0.19 ppb (3) N/A 4.0 μg/m3 (17) 29.0
 
July 24, 2021, 9 a.m. 19.0 ppb (18) 8.0 ppb (8) 24.2 ppb (23) 11.0 ppb (11) N/A 1.0 ppb (2) 6.0 ppb (6) 0.2 ppb (3) N/A 8.0 μg/m3 (34) 34.0
 
July 24, 2021, 8 a.m. 38.0 ppb (36) 24.0 ppb (23) 40.2 ppb (38) 14.0 ppb (14) N/A 1.0 ppb (2) 4.0 ppb (4) 0.21 ppb (3) N/A 4.0 μg/m3 (17) 38.0
 
July 24, 2021, 7 a.m. 7.0 ppb (7) 1.0 ppb (1) 9.4 ppb (9) 6.0 ppb (6) N/A 0.0 ppb (0) 14.0 ppb (13) 0.2 ppb (3) N/A 4.0 μg/m3 (17) 17.0
 
July 24, 2021, 6 a.m. 19.0 ppb (18) 6.0 ppb (6) 24.2 ppb (23) 13.0 ppb (13) N/A 1.0 ppb (2) 7.0 ppb (7) 0.27 ppb (4) N/A 9.0 μg/m3 (38) 38.0
 
July 24, 2021, 5 a.m. 22.0 ppb (21) 7.0 ppb (7) 26.8 ppb (26) 15.0 ppb (15) N/A 1.0 ppb (2) 6.0 ppb (6) 0.27 ppb (4) N/A 8.0 μg/m3 (34) 34.0
 
July 24, 2021, 4 a.m. 25.0 ppb (24) 6.0 ppb (6) 29.7 ppb (29) 19.0 ppb (18) N/A 1.0 ppb (2) 7.0 ppb (7) 0.3 ppb (4) N/A 8.0 μg/m3 (34) 34.0
 
July 24, 2021, 3 a.m. 16.0 ppb (16) 2.0 ppb (2) 19.3 ppb (19) 14.0 ppb (14) N/A 1.0 ppb (2) 19.0 ppb (18) 0.28 ppb (4) N/A 12.0 μg/m3 (50) 50.0
 
July 24, 2021, 2 a.m. 12.0 ppb (12) 1.0 ppb (1) 17.6 ppb (17) 12.0 ppb (12) N/A 0.0 ppb (0) 22.0 ppb (21) 0.3 ppb (4) N/A 9.0 μg/m3 (38) 38.0
 
July 24, 2021, 1 a.m. 13.0 ppb (13) 2.0 ppb (2) 16.7 ppb (16) 11.0 ppb (11) N/A 0.0 ppb (0) 26.0 ppb (25) 0.27 ppb (4) N/A 9.0 μg/m3 (38) 38.0
 
July 24, 2021, midnight 5.0 ppb (5) 0.0 ppb (0) 7.9 ppb (8) 4.0 ppb (4) N/A 0.0 ppb (0) 35.0 ppb (33) 0.28 ppb (4) N/A 8.0 μg/m3 (34) 34.0
 
July 23, 2021, 11 p.m. 6.0 ppb (6) 1.0 ppb (1) 9.5 ppb (9) 5.0 ppb (5) N/A 1.0 ppb (2) 32.0 ppb (30) 0.25 ppb (3) N/A 3.0 μg/m3 (13) 30.0
 
July 23, 2021, 10 p.m. 7.0 ppb (7) 2.0 ppb (2) 9.2 ppb (9) 5.0 ppb (5) N/A 1.0 ppb (2) 33.0 ppb (31) 0.21 ppb (3) N/A 5.0 μg/m3 (21) 31.0
 
July 23, 2021, 9 p.m. 5.0 ppb (5) 1.0 ppb (1) 7.5 ppb (8) 4.0 ppb (4) N/A 1.0 ppb (2) 34.0 ppb (32) 0.22 ppb (3) N/A 6.0 μg/m3 (25) 32.0
 
July 23, 2021, 8 p.m. 5.0 ppb (5) 1.0 ppb (1) 7.9 ppb (8) 4.0 ppb (4) N/A 1.0 ppb (2) 33.0 ppb (31) N/A N/A 3.0 μg/m3 (13) 31.0
 
July 23, 2021, 7 p.m. 6.0 ppb (6) 2.0 ppb (2) 9.1 ppb (9) 4.0 ppb (4) N/A 1.0 ppb (2) 34.0 ppb (32) 0.43 ppb (5) N/A 4.0 μg/m3 (17) 32.0
 
July 23, 2021, 6 p.m. 4.0 ppb (4) 2.0 ppb (2) 6.5 ppb (7) 2.0 ppb (2) N/A 1.0 ppb (2) 35.0 ppb (33) 0.27 ppb (4) N/A 7.0 μg/m3 (30) 33.0
 
July 23, 2021, 5 p.m. 7.0 ppb (7) 2.0 ppb (2) 11.0 ppb (11) 5.0 ppb (5) N/A 1.0 ppb (2) 36.0 ppb (34) 0.46 ppb (6) N/A 12.0 μg/m3 (50) 50.0
 
July 23, 2021, 4 p.m. 4.0 ppb (4) 1.0 ppb (1) 8.0 ppb (8) 3.0 ppb (3) N/A 0.0 ppb (0) 39.0 ppb (37) 0.27 ppb (4) N/A 6.0 μg/m3 (25) 37.0
 
July 23, 2021, 3 p.m. 4.0 ppb (4) 2.0 ppb (2) 7.7 ppb (8) 2.0 ppb (2) N/A 0.0 ppb (0) 33.0 ppb (31) 0.15 ppb (2) N/A 6.0 μg/m3 (25) 31.0
 
July 23, 2021, 2 p.m. 6.0 ppb (6) 3.0 ppb (3) 8.8 ppb (9) 4.0 ppb (4) N/A 1.0 ppb (2) 29.0 ppb (27) 0.16 ppb (3) N/A 6.0 μg/m3 (25) 27.0
 
July 23, 2021, 1 p.m. 6.0 ppb (6) 3.0 ppb (3) 9.7 ppb (10) 4.0 ppb (4) N/A 1.0 ppb (2) 24.0 ppb (23) 0.16 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
July 23, 2021, noon 8.0 ppb (8) 3.0 ppb (3) 10.8 ppb (11) 5.0 ppb (5) N/A 1.0 ppb (2) 18.0 ppb (17) 0.16 ppb (3) N/A 5.0 μg/m3 (21) 21.0
 
July 23, 2021, 11 a.m. 23.0 ppb (22) 14.0 ppb (14) 24.6 ppb (24) 10.0 ppb (10) N/A 1.0 ppb (2) 11.0 ppb (11) 0.17 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
July 23, 2021, 10 a.m. 13.0 ppb (13) 5.0 ppb (5) 16.7 ppb (16) 8.0 ppb (8) N/A 1.0 ppb (2) 10.0 ppb (10) 0.17 ppb (3) N/A 7.0 μg/m3 (30) 30.0
 
July 23, 2021, 9 a.m. 8.0 ppb (8) 2.0 ppb (2) 10.9 ppb (11) 6.0 ppb (6) N/A 1.0 ppb (2) 11.0 ppb (11) 0.15 ppb (2) N/A 5.0 μg/m3 (21) 21.0
 
July 23, 2021, 8 a.m. 15.0 ppb (15) 7.0 ppb (7) 16.5 ppb (16) 7.0 ppb (7) N/A 1.0 ppb (2) 10.0 ppb (10) 0.14 ppb (2) N/A 1.0 μg/m3 (5) 16.0
 
July 23, 2021, 7 a.m. 31.0 ppb (30) 19.0 ppb (18) 30.9 ppb (30) 11.0 ppb (11) N/A 1.0 ppb (2) 7.0 ppb (7) 0.14 ppb (2) N/A 0.0 μg/m3 (0) 30.0
 
July 23, 2021, 6 a.m. 18.0 ppb (17) 8.0 ppb (8) 22.7 ppb (22) 9.0 ppb (9) N/A 1.0 ppb (2) 8.0 ppb (8) 0.15 ppb (2) N/A -2.0 μg/m3 (0) 22.0
 
July 23, 2021, 5 a.m. 12.0 ppb (12) 3.0 ppb (3) 15.1 ppb (15) 9.0 ppb (9) N/A 1.0 ppb (2) 10.0 ppb (10) 0.17 ppb (3) N/A 2.0 μg/m3 (9) 15.0
 
July 23, 2021, 4 a.m. 12.0 ppb (12) 2.0 ppb (2) 16.9 ppb (16) 10.0 ppb (10) N/A 1.0 ppb (2) 11.0 ppb (11) 0.24 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
July 23, 2021, 3 a.m. 10.0 ppb (10) 0.0 ppb (0) 13.9 ppb (14) 10.0 ppb (10) N/A 0.0 ppb (0) 14.0 ppb (13) 0.26 ppb (4) N/A 6.0 μg/m3 (25) 25.0
 
July 23, 2021, 2 a.m. 10.0 ppb (10) 0.0 ppb (0) 13.9 ppb (14) 10.0 ppb (10) N/A 0.0 ppb (0) 17.0 ppb (16) 0.32 ppb (4) N/A 11.0 μg/m3 (46) 46.0
 
July 23, 2021, 1 a.m. 11.0 ppb (11) 1.0 ppb (1) 14.0 ppb (14) 10.0 ppb (10) N/A 0.0 ppb (0) 18.0 ppb (17) 0.3 ppb (4) N/A 12.0 μg/m3 (50) 50.0
 
July 23, 2021, midnight 14.0 ppb (14) 3.0 ppb (3) 16.6 ppb (16) 11.0 ppb (11) N/A 1.0 ppb (2) 23.0 ppb (22) 0.2 ppb (3) N/A 3.0 μg/m3 (13) 22.0
 
July 22, 2021, 11 p.m. 7.0 ppb (7) 1.0 ppb (1) 10.2 ppb (10) 6.0 ppb (6) N/A 1.0 ppb (2) 25.0 ppb (24) 0.25 ppb (3) N/A 5.0 μg/m3 (21) 24.0
 
July 22, 2021, 10 p.m. 4.0 ppb (4) 1.0 ppb (1) 6.8 ppb (7) 3.0 ppb (3) N/A 1.0 ppb (2) 28.0 ppb (26) 0.22 ppb (3) N/A 4.0 μg/m3 (17) 26.0
 
July 22, 2021, 9 p.m. 4.0 ppb (4) 1.0 ppb (1) 7.1 ppb (7) 3.0 ppb (3) N/A 1.0 ppb (2) 28.0 ppb (26) 0.2 ppb (3) N/A 1.0 μg/m3 (5) 26.0
 
July 22, 2021, 8 p.m. 5.0 ppb (5) 1.0 ppb (1) 7.5 ppb (8) 3.0 ppb (3) N/A 0.0 ppb (0) 32.0 ppb (30) 0.19 ppb (3) N/A 3.0 μg/m3 (13) 30.0
 
July 22, 2021, 7 p.m. 7.0 ppb (7) 2.0 ppb (2) 10.9 ppb (11) 5.0 ppb (5) N/A 1.0 ppb (2) 44.0 ppb (41) 0.31 ppb (4) N/A 2.0 μg/m3 (9) 41.0
 
July 22, 2021, 6 p.m. 7.0 ppb (7) 2.0 ppb (2) 10.3 ppb (10) 5.0 ppb (5) N/A 1.0 ppb (2) 41.0 ppb (38) 0.31 ppb (4) N/A 3.0 μg/m3 (13) 38.0
 
July 22, 2021, 5 p.m. 4.0 ppb (4) 2.0 ppb (2) 7.7 ppb (8) 3.0 ppb (3) N/A 1.0 ppb (2) 37.0 ppb (35) 0.2 ppb (3) N/A 4.0 μg/m3 (17) 35.0
 
July 22, 2021, 4 p.m. 5.0 ppb (5) 2.0 ppb (2) 7.7 ppb (8) 3.0 ppb (3) N/A 1.0 ppb (2) 38.0 ppb (36) 0.24 ppb (3) N/A 1.0 μg/m3 (5) 36.0
 
July 22, 2021, 3 p.m. 5.0 ppb (5) 2.0 ppb (2) 7.6 ppb (8) 3.0 ppb (3) N/A 1.0 ppb (2) 34.0 ppb (32) 0.35 ppb (4) N/A 1.0 μg/m3 (5) 32.0
 
July 22, 2021, 2 p.m. 7.0 ppb (7) 3.0 ppb (3) 8.7 ppb (9) 4.0 ppb (4) N/A 1.0 ppb (2) 29.0 ppb (27) 0.24 ppb (3) N/A N/A 27.0
 
July 22, 2021, 1 p.m. 8.0 ppb (8) 3.0 ppb (3) 10.4 ppb (10) 5.0 ppb (5) N/A 1.0 ppb (2) 23.0 ppb (22) 0.21 ppb (3) N/A 3.0 μg/m3 (13) 22.0
 
July 22, 2021, noon 10.0 ppb (10) 5.0 ppb (5) 11.7 ppb (12) 5.0 ppb (5) N/A 0.0 ppb (0) 19.0 ppb (18) 0.2 ppb (3) N/A 4.0 μg/m3 (17) 18.0
 
July 22, 2021, 11 a.m. 8.0 ppb (8) 3.0 ppb (3) 11.8 ppb (12) 5.0 ppb (5) N/A 1.0 ppb (2) 17.0 ppb (16) 0.18 ppb (3) N/A 2.0 μg/m3 (9) 16.0
 
July 22, 2021, 10 a.m. 5.0 ppb (5) 2.0 ppb (2) 7.9 ppb (8) 4.0 ppb (4) N/A 1.0 ppb (2) 17.0 ppb (16) N/A N/A 1.0 μg/m3 (5) 16.0
 
July 22, 2021, 9 a.m. 11.0 ppb (11) 4.0 ppb (4) 12.2 ppb (12) 7.0 ppb (7) N/A 1.0 ppb (2) 15.0 ppb (14) 0.15 ppb (2) N/A 3.0 μg/m3 (13) 14.0
 
July 22, 2021, 8 a.m. 26.0 ppb (25) 12.0 ppb (12) 29.2 ppb (28) 14.0 ppb (14) N/A 1.0 ppb (2) N/A 0.16 ppb (3) N/A 2.0 μg/m3 (9) 28.0
 
July 22, 2021, 7 a.m. N/A N/A 13.0 ppb (13) N/A N/A 0.0 ppb (0) 15.0 ppb (14) 0.17 ppb (3) N/A 5.0 μg/m3 (21) 21.0
 
July 22, 2021, 6 a.m. N/A N/A 5.5 ppb (6) N/A N/A 0.0 ppb (0) 21.0 ppb (20) 0.18 ppb (3) N/A 7.0 μg/m3 (30) 30.0
 
July 22, 2021, 5 a.m. N/A N/A 8.8 ppb (9) N/A N/A 0.0 ppb (0) 21.0 ppb (20) 0.16 ppb (3) N/A 4.0 μg/m3 (17) 20.0
 
July 22, 2021, 4 a.m. 9.0 ppb (9) 2.0 ppb (2) 11.1 ppb (11) 7.0 ppb (7) N/A N/A 22.0 ppb (21) 0.17 ppb (3) N/A 7.0 μg/m3 (30) 30.0
 
July 22, 2021, 3 a.m. 8.0 ppb (8) 2.0 ppb (2) 12.8 ppb (13) 6.0 ppb (6) N/A N/A 23.0 ppb (22) 0.19 ppb (3) N/A 8.0 μg/m3 (34) 34.0
 
July 22, 2021, 2 a.m. 1.0 ppb (1) 0.0 ppb (0) 4.3 ppb (5) 1.0 ppb (1) N/A N/A 32.0 ppb (30) 0.2 ppb (3) N/A 2.0 μg/m3 (9) 30.0
 
July 22, 2021, 1 a.m. 1.0 ppb (1) 0.0 ppb (0) 3.6 ppb (4) 1.0 ppb (1) N/A 0.0 ppb (0) 35.0 ppb (33) 0.23 ppb (3) N/A -2.0 μg/m3 (0) 33.0
 
July 22, 2021, midnight 1.0 ppb (1) 0.0 ppb (0) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 35.0 ppb (33) 0.26 ppb (4) N/A 5.0 μg/m3 (21) 33.0
 
July 21, 2021, 11 p.m. 7.0 ppb (7) 1.0 ppb (1) N/A 6.0 ppb (6) N/A 0.0 ppb (0) 34.0 ppb (32) 0.34 ppb (4) N/A 12.0 μg/m3 (50) 50.0
 
July 21, 2021, 10 p.m. 3.0 ppb (3) 1.0 ppb (1) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 40.0 ppb (38) 0.32 ppb (4) N/A 8.0 μg/m3 (34) 38.0
 
July 21, 2021, 9 p.m. 3.0 ppb (3) 1.0 ppb (1) 6.2 ppb (6) 2.0 ppb (2) N/A 1.0 ppb (2) 42.0 ppb (39) 0.31 ppb (4) N/A 6.0 μg/m3 (25) 39.0
 
July 21, 2021, 8 p.m. 4.0 ppb (4) 1.0 ppb (1) 7.6 ppb (8) 4.0 ppb (4) N/A 0.0 ppb (0) 42.0 ppb (39) 0.33 ppb (4) N/A 10.0 μg/m3 (42) 42.0
 
July 21, 2021, 7 p.m. 4.0 ppb (4) 1.0 ppb (1) 7.7 ppb (8) 3.0 ppb (3) N/A 0.0 ppb (0) 46.0 ppb (43) 0.34 ppb (4) N/A 15.0 μg/m3 (58) 58.0
 
July 21, 2021, 6 p.m. 5.0 ppb (5) 1.0 ppb (1) 7.8 ppb (8) 3.0 ppb (3) N/A 0.0 ppb (0) 48.0 ppb (45) 0.3 ppb (4) N/A 15.0 μg/m3 (58) 58.0
 
July 21, 2021, 5 p.m. 4.0 ppb (4) 1.0 ppb (1) 7.3 ppb (7) 3.0 ppb (3) N/A 0.0 ppb (0) 49.0 ppb (46) 0.3 ppb (4) N/A 13.0 μg/m3 (53) 53.0
 
July 21, 2021, 4 p.m. 4.0 ppb (4) 1.0 ppb (1) 6.6 ppb (7) 3.0 ppb (3) N/A 0.0 ppb (0) 54.0 ppb (50) 0.31 ppb (4) N/A 13.0 μg/m3 (53) 53.0
 
July 21, 2021, 3 p.m. 4.0 ppb (4) 1.0 ppb (1) 6.8 ppb (7) 3.0 ppb (3) N/A 0.0 ppb (0) 54.0 ppb (50) 0.32 ppb (4) N/A 15.0 μg/m3 (58) 58.0
 
July 21, 2021, 2 p.m. 4.0 ppb (4) 1.0 ppb (1) 7.4 ppb (7) 3.0 ppb (3) N/A 0.0 ppb (0) 49.0 ppb (46) 0.35 ppb (4) N/A 13.0 μg/m3 (53) 53.0
 
July 21, 2021, 1 p.m. 5.0 ppb (5) 1.0 ppb (1) 8.6 ppb (9) 4.0 ppb (4) N/A 0.0 ppb (0) 42.0 ppb (39) 0.4 ppb (5) N/A 11.0 μg/m3 (46) 46.0
 
July 21, 2021, noon 11.0 ppb (11) 3.0 ppb (3) 14.6 ppb (14) 9.0 ppb (9) N/A 0.0 ppb (0) 26.0 ppb (25) 0.48 ppb (6) N/A 23.0 μg/m3 (74) 74.0
 
July 21, 2021, 11 a.m. 18.0 ppb (17) 3.0 ppb (3) 22.7 ppb (22) 15.0 ppb (15) N/A 0.0 ppb (0) 21.0 ppb (20) 0.47 ppb (6) N/A 19.0 μg/m3 (66) 66.0
 
July 21, 2021, 10 a.m. 15.0 ppb (15) 2.0 ppb (2) 19.7 ppb (19) 14.0 ppb (14) N/A 0.0 ppb (0) 18.0 ppb (17) 0.48 ppb (6) N/A 19.0 μg/m3 (66) 66.0
 
July 21, 2021, 9 a.m. 8.0 ppb (8) 1.0 ppb (1) 11.8 ppb (12) 8.0 ppb (8) N/A 0.0 ppb (0) 22.0 ppb (21) 0.42 ppb (5) N/A 15.0 μg/m3 (58) 58.0
 
July 21, 2021, 8 a.m. 5.0 ppb (5) 0.0 ppb (0) 8.0 ppb (8) 5.0 ppb (5) N/A 0.0 ppb (0) 29.0 ppb (27) 0.38 ppb (5) N/A 15.0 μg/m3 (58) 58.0
 
July 21, 2021, 7 a.m. 3.0 ppb (3) 0.0 ppb (0) 6.3 ppb (6) 3.0 ppb (3) N/A 0.0 ppb (0) 38.0 ppb (36) 0.39 ppb (5) N/A 14.0 μg/m3 (55) 55.0
 
July 21, 2021, 6 a.m. 5.0 ppb (5) 0.0 ppb (0) 8.4 ppb (8) 5.0 ppb (5) N/A 0.0 ppb (0) 44.0 ppb (41) 0.4 ppb (5) N/A 10.0 μg/m3 (42) 42.0
 
July 21, 2021, 5 a.m. 1.0 ppb (1) 0.0 ppb (0) 4.2 ppb (4) 1.0 ppb (1) N/A 0.0 ppb (0) 52.0 ppb (49) 0.35 ppb (4) N/A 17.0 μg/m3 (62) 62.0
 
July 21, 2021, 4 a.m. 4.0 ppb (4) 0.0 ppb (0) 7.9 ppb (8) 4.0 ppb (4) N/A 1.0 ppb (2) 28.0 ppb (26) 0.51 ppb (6) N/A 50.0 μg/m3 (137) 137.0
 
July 21, 2021, 3 a.m. 5.0 ppb (5) 0.0 ppb (0) 8.7 ppb (9) 5.0 ppb (5) N/A 1.0 ppb (2) 26.0 ppb (25) 0.57 ppb (7) N/A 55.0 μg/m3 (150) 150.0
 
July 21, 2021, 2 a.m. 8.0 ppb (8) 0.0 ppb (0) 11.8 ppb (12) 8.0 ppb (8) N/A 1.0 ppb (2) 25.0 ppb (24) 0.58 ppb (7) N/A 53.0 μg/m3 (145) 145.0
 
July 21, 2021, 1 a.m. 7.0 ppb (7) 0.0 ppb (0) 11.3 ppb (11) 7.0 ppb (7) N/A 1.0 ppb (2) 27.0 ppb (25) N/A N/A 52.0 μg/m3 (142) 142.0
 
July 21, 2021, midnight 6.0 ppb (6) 0.0 ppb (0) 10.2 ppb (10) 6.0 ppb (6) N/A 1.0 ppb (2) 31.0 ppb (29) 0.61 ppb (7) N/A 51.0 μg/m3 (140) 140.0
 
July 20, 2021, 11 p.m. 5.0 ppb (5) 1.0 ppb (1) 8.6 ppb (9) 5.0 ppb (5) N/A 1.0 ppb (2) 36.0 ppb (34) 0.57 ppb (7) N/A 48.0 μg/m3 (132) 132.0
 
July 20, 2021, 10 p.m. 3.0 ppb (3) 0.0 ppb (0) 6.5 ppb (7) 3.0 ppb (3) N/A 1.0 ppb (2) 41.0 ppb (38) 0.53 ppb (6) N/A 48.0 μg/m3 (132) 132.0
 
July 20, 2021, 9 p.m. 3.0 ppb (3) 0.0 ppb (0) 6.7 ppb (7) 3.0 ppb (3) N/A 1.0 ppb (2) 43.0 ppb (40) 0.48 ppb (6) N/A 47.0 μg/m3 (130) 130.0
 
July 20, 2021, 8 p.m. 3.0 ppb (3) 1.0 ppb (1) 6.6 ppb (7) 2.0 ppb (2) N/A 1.0 ppb (2) 44.0 ppb (41) 0.49 ppb (6) N/A 44.0 μg/m3 (122) 122.0
 
July 20, 2021, 7 p.m. 3.0 ppb (3) 1.0 ppb (1) 6.2 ppb (6) 2.0 ppb (2) N/A 0.0 ppb (0) 45.0 ppb (42) 0.47 ppb (6) N/A 42.0 μg/m3 (118) 118.0
 
July 20, 2021, 6 p.m. 3.0 ppb (3) 1.0 ppb (1) 6.8 ppb (7) 2.0 ppb (2) N/A 1.0 ppb (2) 43.0 ppb (40) 0.45 ppb (6) N/A 37.0 μg/m3 (105) 105.0
 
July 20, 2021, 5 p.m. 5.0 ppb (5) 1.0 ppb (1) 8.2 ppb (8) 3.0 ppb (3) N/A 1.0 ppb (2) 41.0 ppb (38) 0.43 ppb (5) N/A 41.0 μg/m3 (115) 115.0
 
July 20, 2021, 4 p.m. 4.0 ppb (4) 1.0 ppb (1) 8.3 ppb (8) 4.0 ppb (4) N/A 1.0 ppb (2) 37.0 ppb (35) N/A N/A 35.0 μg/m3 (100) 100.0
 
July 20, 2021, 3 p.m. 7.0 ppb (7) 2.0 ppb (2) 10.3 ppb (10) 5.0 ppb (5) N/A 1.0 ppb (2) 30.0 ppb (28) 0.45 ppb (6) N/A 30.0 μg/m3 (89) 89.0
 
July 20, 2021, 2 p.m. 9.0 ppb (9) 4.0 ppb (4) 12.7 ppb (12) 6.0 ppb (6) N/A 1.0 ppb (2) 23.0 ppb (22) 0.36 ppb (5) N/A 24.0 μg/m3 (77) 77.0
 
July 20, 2021, 1 p.m. 16.0 ppb (16) 8.0 ppb (8) 21.0 ppb (20) 9.0 ppb (9) N/A 1.0 ppb (2) 13.0 ppb (13) 0.32 ppb (4) N/A 18.0 μg/m3 (64) 64.0
 
July 20, 2021, noon 12.0 ppb (12) 6.0 ppb (6) 15.5 ppb (15) 7.0 ppb (7) N/A 1.0 ppb (2) 8.0 ppb (8) 0.32 ppb (4) N/A 10.0 μg/m3 (42) 42.0
 
July 20, 2021, 11 a.m. 16.0 ppb (16) 8.0 ppb (8) 19.6 ppb (19) 9.0 ppb (9) N/A 1.0 ppb (2) 5.0 ppb (5) 0.31 ppb (4) N/A 7.0 μg/m3 (30) 30.0
 
July 20, 2021, 10 a.m. 19.0 ppb (18) 11.0 ppb (11) 22.2 ppb (21) 8.0 ppb (8) N/A 1.0 ppb (2) 2.0 ppb (2) 0.33 ppb (4) N/A 5.0 μg/m3 (21) 21.0
 
July 20, 2021, 9 a.m. 12.0 ppb (12) 5.0 ppb (5) 15.2 ppb (15) 7.0 ppb (7) N/A 1.0 ppb (2) 2.0 ppb (2) 0.29 ppb (4) N/A 2.0 μg/m3 (9) 15.0
 
July 20, 2021, 8 a.m. 4.0 ppb (4) 1.0 ppb (1) 6.7 ppb (7) 3.0 ppb (3) N/A 1.0 ppb (2) 6.0 ppb (6) 0.23 ppb (3) N/A 3.0 μg/m3 (13) 13.0
 
July 20, 2021, 7 a.m. 3.0 ppb (3) 1.0 ppb (1) 6.4 ppb (7) 3.0 ppb (3) N/A 1.0 ppb (2) 6.0 ppb (6) 0.27 ppb (4) N/A 2.0 μg/m3 (9) 9.0
 
July 20, 2021, 6 a.m. 3.0 ppb (3) 1.0 ppb (1) 5.8 ppb (6) 2.0 ppb (2) N/A 0.0 ppb (0) 7.0 ppb (7) 0.25 ppb (3) N/A 0.0 μg/m3 (0) 7.0
 
July 20, 2021, 5 a.m. 2.0 ppb (2) 0.0 ppb (0) 4.7 ppb (5) 2.0 ppb (2) N/A 0.0 ppb (0) 9.0 ppb (9) 0.2 ppb (3) N/A 0.0 μg/m3 (0) 9.0
 
July 20, 2021, 4 a.m. 3.0 ppb (3) 0.0 ppb (0) 6.0 ppb (6) 3.0 ppb (3) N/A 0.0 ppb (0) 11.0 ppb (11) 0.22 ppb (3) N/A 2.0 μg/m3 (9) 11.0
 
July 20, 2021, 3 a.m. 12.0 ppb (12) 2.0 ppb (2) 15.9 ppb (15) 10.0 ppb (10) N/A 1.0 ppb (2) 6.0 ppb (6) 0.3 ppb (4) N/A 6.0 μg/m3 (25) 25.0
 
July 20, 2021, 2 a.m. 14.0 ppb (14) 2.0 ppb (2) 18.4 ppb (18) 13.0 ppb (13) N/A 1.0 ppb (2) 5.0 ppb (5) 0.39 ppb (5) N/A 8.0 μg/m3 (34) 34.0
 
July 20, 2021, 1 a.m. 21.0 ppb (20) 3.0 ppb (3) 25.2 ppb (24) 19.0 ppb (18) N/A 1.0 ppb (2) 5.0 ppb (5) 0.47 ppb (6) N/A 8.0 μg/m3 (34) 34.0
 
July 20, 2021, midnight 17.0 ppb (17) 2.0 ppb (2) 21.7 ppb (21) 15.0 ppb (15) N/A 0.0 ppb (0) 9.0 ppb (9) 0.4 ppb (5) N/A 5.0 μg/m3 (21) 21.0
 
July 19, 2021, 11 p.m. 12.0 ppb (12) 2.0 ppb (2) 15.2 ppb (15) 10.0 ppb (10) N/A 0.0 ppb (0) 15.0 ppb (14) 0.32 ppb (4) N/A 5.0 μg/m3 (21) 21.0
 
July 19, 2021, 10 p.m. 9.0 ppb (9) 2.0 ppb (2) 13.4 ppb (13) 7.0 ppb (7) N/A 1.0 ppb (2) 18.0 ppb (17) 0.28 ppb (4) N/A 3.0 μg/m3 (13) 17.0
 
July 19, 2021, 9 p.m. 10.0 ppb (10) 3.0 ppb (3) 14.0 ppb (14) 7.0 ppb (7) N/A 1.0 ppb (2) 18.0 ppb (17) 0.28 ppb (4) N/A 3.0 μg/m3 (13) 17.0
 
July 19, 2021, 8 p.m. 12.0 ppb (12) 4.0 ppb (4) 16.3 ppb (16) 9.0 ppb (9) N/A 0.0 ppb (0) 16.0 ppb (15) N/A N/A 2.0 μg/m3 (9) 16.0
 
July 19, 2021, 7 p.m. 15.0 ppb (15) 5.0 ppb (5) 18.6 ppb (18) 10.0 ppb (10) N/A 0.0 ppb (0) 15.0 ppb (14) 0.25 ppb (3) N/A 0.0 μg/m3 (0) 18.0
 
July 19, 2021, 6 p.m. 12.0 ppb (12) 5.0 ppb (5) 16.5 ppb (16) 7.0 ppb (7) N/A 0.0 ppb (0) 16.0 ppb (15) 0.21 ppb (3) N/A -1.0 μg/m3 (0) 16.0
 
July 19, 2021, 5 p.m. 14.0 ppb (14) 6.0 ppb (6) 17.7 ppb (17) 9.0 ppb (9) N/A 0.0 ppb (0) 12.0 ppb (12) 0.21 ppb (3) N/A 0.0 μg/m3 (0) 17.0
 
July 19, 2021, 4 p.m. 10.0 ppb (10) 4.0 ppb (4) 12.4 ppb (12) 6.0 ppb (6) N/A 0.0 ppb (0) 15.0 ppb (14) 0.22 ppb (3) N/A -3.0 μg/m3 (0) 14.0
 
July 19, 2021, 3 p.m. 13.0 ppb (13) 5.0 ppb (5) 15.3 ppb (15) 8.0 ppb (8) N/A 0.0 ppb (0) 13.0 ppb (13) 0.21 ppb (3) N/A -2.0 μg/m3 (0) 15.0
 
July 19, 2021, 2 p.m. 18.0 ppb (17) 6.0 ppb (6) 20.1 ppb (19) 11.0 ppb (11) N/A 1.0 ppb (2) 12.0 ppb (12) 0.26 ppb (4) N/A -1.0 μg/m3 (0) 19.0
 
July 19, 2021, 1 p.m. 19.0 ppb (18) 6.0 ppb (6) 23.6 ppb (23) 13.0 ppb (13) N/A 0.0 ppb (0) 9.0 ppb (9) 0.24 ppb (3) N/A 0.0 μg/m3 (0) 23.0
 
July 19, 2021, noon 17.0 ppb (17) 5.0 ppb (5) 20.5 ppb (20) 13.0 ppb (13) N/A 0.0 ppb (0) 10.0 ppb (10) 0.21 ppb (3) N/A 3.0 μg/m3 (13) 20.0
 
July 19, 2021, 11 a.m. 20.0 ppb (19) 6.0 ppb (6) 21.1 ppb (20) 13.0 ppb (13) N/A 0.0 ppb (0) 11.0 ppb (11) 0.19 ppb (3) N/A 3.0 μg/m3 (13) 20.0
 
July 19, 2021, 10 a.m. 13.0 ppb (13) 2.0 ppb (2) 17.3 ppb (17) 11.0 ppb (11) N/A 0.0 ppb (0) 13.0 ppb (13) N/A N/A 2.0 μg/m3 (9) 17.0
 
July 19, 2021, 9 a.m. 7.0 ppb (7) 1.0 ppb (1) 10.1 ppb (10) 6.0 ppb (6) N/A 0.0 ppb (0) 17.0 ppb (16) 0.16 ppb (3) N/A 0.0 μg/m3 (0) 16.0
 
July 19, 2021, 8 a.m. 5.0 ppb (5) 0.0 ppb (0) 8.5 ppb (9) 5.0 ppb (5) N/A 0.0 ppb (0) N/A 0.13 ppb (2) N/A -1.0 μg/m3 (0) 9.0
 
July 19, 2021, 7 a.m. N/A N/A 7.8 ppb (8) N/A N/A 0.0 ppb (0) 22.0 ppb (21) N/A N/A -2.0 μg/m3 (0) 21.0
 
July 19, 2021, 6 a.m. N/A N/A 8.2 ppb (8) N/A N/A 0.0 ppb (0) 22.0 ppb (21) 0.14 ppb (2) N/A -3.0 μg/m3 (0) 21.0
 
July 19, 2021, 5 a.m. N/A N/A 6.3 ppb (6) N/A N/A 0.0 ppb (0) 23.0 ppb (22) 0.15 ppb (2) N/A 0.0 μg/m3 (0) 22.0
 
July 19, 2021, 4 a.m. 4.0 ppb (4) 0.0 ppb (0) 6.8 ppb (7) 4.0 ppb (4) N/A N/A 24.0 ppb (23) 0.15 ppb (2) N/A 1.0 μg/m3 (5) 23.0
 
July 19, 2021, 3 a.m. 3.0 ppb (3) 0.0 ppb (0) 6.2 ppb (6) 3.0 ppb (3) N/A N/A 25.0 ppb (24) 0.17 ppb (3) N/A 1.0 μg/m3 (5) 24.0
 
July 19, 2021, 2 a.m. 3.0 ppb (3) 0.0 ppb (0) 6.1 ppb (6) 3.0 ppb (3) N/A N/A 25.0 ppb (24) 0.17 ppb (3) N/A 3.0 μg/m3 (13) 24.0
 
July 19, 2021, 1 a.m. 4.0 ppb (4) 1.0 ppb (1) 8.3 ppb (8) 4.0 ppb (4) N/A 0.0 ppb (0) 24.0 ppb (23) 0.18 ppb (3) N/A 1.0 μg/m3 (5) 23.0
 
July 19, 2021, midnight 5.0 ppb (5) 0.0 ppb (0) N/A 5.0 ppb (5) N/A 0.0 ppb (0) 23.0 ppb (22) 0.19 ppb (3) N/A 1.0 μg/m3 (5) 22.0
 
July 18, 2021, 11 p.m. 8.0 ppb (8) 1.0 ppb (1) N/A 7.0 ppb (7) N/A 0.0 ppb (0) 21.0 ppb (20) 0.21 ppb (3) N/A -2.0 μg/m3 (0) 20.0
 
July 18, 2021, 10 p.m. 9.0 ppb (9) 1.0 ppb (1) N/A 8.0 ppb (8) N/A 0.0 ppb (0) 21.0 ppb (20) 0.21 ppb (3) N/A 0.0 μg/m3 (0) 20.0